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Pull up following revision(s) (requested by manu in ticket #829):
	lib/libpthread_dbg/pthread_dbg.c: revision 1.43 (via patch)
	lib/libpthread/pthread_int.h: revision 1.91-1.92 (via patch)
	lib/libc/stdlib/jemalloc.c: revision 1.37-1.38
	lib/libpthread/pthread_tsd.c: revision 1.12-1.14 (via patch)
	include/limits.h: revision 1.34 (via patch)
	lib/libpthread/pthread.c: revision 1.146-1.147 (via patch)
	lib/libpthread/pthread_key_create.3: revision 1.7 (via patch)

libpthread:

Make PTHREAD_KEYS_MAX dynamically adjustable
NetBSD's PTHREAD_KEYS_MAX is set to 256, which is low compared to
other systems like Linux (1024) or MacOS X (512). As a result some
setups tested on Linux will exhibit problems on NetBSD because of
pthread_keys usage beyond the limit. This happens for instance on
Apache with various module loaded, and in this case no particular
developper can be blamed for going beyond the limit, since several
modules from different sources contribute to the problem.
This patch makes the limit conigurable through the PTHREAD_KEYS_MAX
environement variable. If undefined, the default remains unchanged
(256). In any case, the value cannot be lowered below POSIX-mandated
_POSIX_THREAD_KEYS_MAX (128).

While there:
- use EXIT_FAILURE instead of 1 when calling err(3) in libpthread.
- Reset _POSIX_THREAD_KEYS_MAX to POSIX mandated 128, instead of 256.

Fix previous: Can't use calloc/malloc before we complete initialization
of the thread library, because malloc uses pthread_foo_specific, and it will
end up initializing itself incorrectly.

Thanks rump for not letting us use even mmap during initialization.

libc/jemalloc:

Fix non _REENTRANT build.
Defer using pthread keys until we are threaded.
From Christos, fixes PR port-arm/50087 by allowing malloc calls prior
to libpthread initialization.

/*	$NetBSD: limits.h,v 1.33.8.1 2015/11/24 17:37:16 martin Exp $	*/

/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)limits.h	8.2 (Berkeley) 1/4/94
 */

#ifndef _LIMITS_H_
#define	_LIMITS_H_

#include <sys/featuretest.h>

#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \
    defined(_NETBSD_SOURCE)
#define	_POSIX_AIO_LISTIO_MAX	2
#define	_POSIX_AIO_MAX		1
#define	_POSIX_ARG_MAX		4096
#define	_POSIX_CHILD_MAX	25
#define	_POSIX_HOST_NAME_MAX	255
#define	_POSIX_LINK_MAX		8
#define	_POSIX_LOGIN_NAME_MAX	9
#define	_POSIX_MAX_CANON	255
#define	_POSIX_MAX_INPUT	255
#define	_POSIX_MQ_OPEN_MAX	8
#define	_POSIX_MQ_PRIO_MAX	32
#define	_POSIX_NAME_MAX		14
#define	_POSIX_NGROUPS_MAX	8
#define	_POSIX_OPEN_MAX		20
#define	_POSIX_PATH_MAX		256
#define	_POSIX_PIPE_BUF		512
#define	_POSIX_RE_DUP_MAX	255
#define	_POSIX_SSIZE_MAX	32767
#define	_POSIX_STREAM_MAX	8
#define	_POSIX_SYMLINK_MAX	255
#define	_POSIX_SYMLOOP_MAX	8

/*
 * We have not implemented these yet
 *
 * _POSIX_THREAD_ATTR_STACKADDR
 * _POSIX_THREAD_ATTR_STACKSIZE
 * _POSIX_THREAD_CPUTIME
 * _POSIX_THREAD_PRIORITY_SCHEDULING
 * _POSIX_THREAD_PRIO_INHERIT
 * _POSIX_THREAD_PRIO_PROTECT
 * _POSIX_THREAD_PROCESS_SHARED
 * _POSIX_THREAD_SAFE_FUNCTIONS
 * _POSIX_THREAD_SPORADIC_SERVER
 */

/*
 * The following 3 are defined in 
 * Open Group Base Specifications Issue 7
 */
#define	_POSIX_THREAD_DESTRUCTOR_ITERATIONS	4
#define	_POSIX_THREAD_KEYS_MAX			128
#define	_POSIX_THREAD_THREADS_MAX		64

/*
 * These are the correct names, defined in terms of the above
 * except for PTHREAD_KEYS_MAX which is bigger than standard 
 * mandated minimum value _POSIX_THREAD_KEYS_MAX.
 */
#define	PTHREAD_DESTRUCTOR_ITERATIONS 	_POSIX_THREAD_DESTRUCTOR_ITERATIONS
#define	PTHREAD_KEYS_MAX		256
/* Not yet: PTHREAD_STACK_MIN */
#define	PTHREAD_THREADS_MAX		_POSIX_THREAD_THREADS_MAX

#define	_POSIX_TIMER_MAX	32
#define	_POSIX_TTY_NAME_MAX	9
#define	_POSIX_TZNAME_MAX	6

#define	_POSIX2_BC_BASE_MAX	99
#define	_POSIX2_BC_DIM_MAX	2048
#define	_POSIX2_BC_SCALE_MAX	99
#define	_POSIX2_BC_STRING_MAX	1000
#define	_POSIX2_CHARCLASS_NAME_MAX	14
#define	_POSIX2_COLL_WEIGHTS_MAX	2
#define	_POSIX2_EXPR_NEST_MAX	32
#define	_POSIX2_LINE_MAX	2048
#define	_POSIX2_RE_DUP_MAX	255

/*
 * X/Open CAE Specifications,
 * adopted in IEEE Std 1003.1-2001 XSI.
 */
#if (_POSIX_C_SOURCE - 0) >= 200112L || defined(_XOPEN_SOURCE) || \
    defined(_NETBSD_SOURCE)
#define	_XOPEN_IOV_MAX		16
#define	_XOPEN_NAME_MAX		256
#define	_XOPEN_PATH_MAX		1024

#define PASS_MAX		128		/* Legacy */

#define CHARCLASS_NAME_MAX	14
#define NL_ARGMAX		9
#define NL_LANGMAX		14
#define NL_MSGMAX		32767
#define NL_NMAX			1
#define NL_SETMAX		255
#define NL_TEXTMAX		2048

	/* IEEE Std 1003.1-2001 TSF */
#define	_GETGR_R_SIZE_MAX	1024
#define	_GETPW_R_SIZE_MAX	1024

/* Always ensure that this is consistent with <stdio.h> */
#ifndef TMP_MAX
#define TMP_MAX			308915776	/* Legacy */
#endif
#endif /* _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE || _NETBSD_SOURCE */

#endif /* _POSIX_C_SOURCE || _XOPEN_SOURCE || _NETBSD_SOURCE */

#define MB_LEN_MAX		32	/* Allow ISO/IEC 2022 */

/*
 * X/Open Extended API set 2 (a.k.a. C063)
 * This hides unimplemented functions from GNU configure until
 * we are done implementing them.
 */
#if !defined(_INCOMPLETE_XOPEN_C063)
#define __stub_fexecve
#endif

#include <machine/limits.h>

#ifdef __CHAR_UNSIGNED__
# define CHAR_MIN     0
# define CHAR_MAX     UCHAR_MAX
#else
# define CHAR_MIN     SCHAR_MIN
# define CHAR_MAX     SCHAR_MAX
#endif

#include <sys/syslimits.h>

#endif /* !_LIMITS_H_ */