CVS log for src/sys/arch/i386/stand/bootxx/bootxx_ustarfs/Makefile

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Pull up following revision(s) (requested by rin in ticket #498):

	sys/arch/i386/stand/dosboot/Makefile: revision 1.35
	sys/arch/i386/stand/Makefile.booters: revision 1.95
	sys/arch/i386/stand/bootxx/bootxx_msdos/Makefile: revision 1.5
	sys/arch/i386/stand/Makefile.inc: revision 1.19
	sys/arch/i386/stand/bootxx/bootxx_ustarfs/Makefile: revision 1.4
	sys/arch/i386/stand/dosboot/Makefile: revision 1.34

Fix the clang build by setting -z noseparate-code

Merge the OPT_SIZE flags. -Oz is not always producing smaller code that -Os,
so default to -Os for both, and we'll override where needed.

Override these two booters with -Oz for clang since it produces smaller code
here.

x86/dosboot: Allow NULL dereference to fetch command line arguments
DOS command line arguments are provided as struct psp at 0x0000;
see doscommain.c.

Recent versions of gcc and clang are clever enough to optimize code
block involving NULL dereference into ud2 insn.

Sprinkle -fno-delete-null-pointer-checks to doscommain.c to
prevent this behavior.

Note that dosboot.com for netbsd-9 and later was broken due to
this ``over optimization''. gcc 5.5.0 and clang 4.0.0 in netbsd-8
generate correct codes without this workaround.

XXX
Are there still use cases for dosboot.com? Does anyone want to
boot NetBSD from real-mode DOS in 2023?

x86/dosboot: Do not page-align data segment
4K alignment is too heavy burden for COM executable with 64K limit :)
Fix binary size overflow for clang/amd64.

Override these two booters with -Oz for clang since it produces smaller code
here.

Sync with HEAD

sync with head

Reinstate the 'banner'.
It is a useful diagnostic that the boot sequence is proceeding.

Sync with HEAD.

sync with head.

sync with head.

Tidy up console output slightly.

bootxx: bootstrap code - installable by MI installboot.
Loads /boot using filesystem accesses (rather than a list of block numbers)