CVS log for pkgsrc/audio/libdiscid/buildlink3.mk

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Fix indentation in buildlink3.mk files.

The actual fix as been done by "pkglint -F */*/buildlink3.mk", and was
reviewed manually.

There are some .include lines that still are indented with zero spaces
although the surrounding .if is indented. This is existing practice.

(pkgsrc)
 - delete patch-ab, NetBSD support improved since 0.5.1
(upstream)
 - Update 0.5.0 to 0.6.1

libdiscid ChangeLog:
--------------------
libdiscid-0.6.1:
 - LIB-59: windows: fix bug preventing ISRC reads

libdiscid-0.6.0:
 - LIB-41: add discid_get_troc_string() for fuzzy toc lookup
 - LIB-54: add libmusicbrainz example with fuzzy toc lookup
 - LIB-43: windows: the default drive is the first cd drive letter
 - LIB-45: Linux/BSD/Solaris: try several possible default device names
 - LIB-28: Mac: allow drive numbers as devices, default now "1"
 - LIB-55, LIB-56: allow drive numbers for Windows and Linux
 - LIB-53: discid_get_submission_url() returns the new NGS url
           currently no functional change, the old url was redirected
 - LIB-52: more validation for parameters of discid_put()
 - LIB-48: assert successful read/put when API is used
 - the discisrc example prints the name of the device usedp

libdiscid-0.5.2:
 - LIB-51: fix ISRC reading on Mac OS X again
 - LIB-50: fix segfault in mb_disc_load_toc on Solaris
 - LIB-26: add a better test suite, including valgrind memcheck target
 - print time information in the discid example

libdiscid-0.5.1:
 - LIB-40: discid_get_webservice_url() (web service version 1) is deprecated
           please use libmusicbrainz to gather metadata by disc ID
 - LIB-7:  rewrote data track handling, releases with multiple data tracks
           This also fixes LIB-18 (no ID for DVDs) and LIB-9 (PS/PS2 CDs)
 - LIB-44: fix invalid disc IDs on first read of multi-session discs
 - LIB-37: Autotools optimization (non-recursive build etc.)
 - LIB-42: remove Windows 9x platform code
 - renamed openbsd platform code to netbsd, still used by both.

Simply and speed up buildlink3.mk files and processing.
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.

libdiscid is a library for creating MusicBrainz DiscIDs from audio CDs.
It reads a CD's table of contents (TOC) and generates an identifier which
can be used to lookup the CD at MusicBrainz (http://musicbrainz.org).
Additionally, it provides a submission URL for adding the DiscID to
the database.

The interface of this library is new, but the DiscID algorithm and the
operating system dependent CD-ROM/DVD-ROM access code have been ported
from libmusicbrainz version 2.

Initial revision