Correct SRCS; bsdstart.S not bsdstart.s.

Fix build with bsd.dep.mk rev 1.87, which requires more strict
filename matching.

Found by martin.

Add empty LIBCRTI= as LIBCRT0 to build sa programs without installed DESTDIR.

XXX: probabry we should have bsd.saprog.mk or something.

branches: 1.7.8; 1.7.18; 1.7.22;
remove almost all the ability to build netbsd with an a.out target.
we're ELF now, and there are many missing checks against OBJECT_FMT.
if we ever consider switching, the we can figure out what new ones
we need but for now it's just clutter.

this doesn't remove any of the support for exec_aout or any actually
required-for-boot a.out support, only the ability to build a netbsd
release in a.out format. ie, most of this code has been dead for
over a decade.

i've tested builds on vax, amd64, i386, mac68k, macppc, sparc, atari,
amiga, shark, cats, dreamcast, landisk, mmeye and x68k. this covers
the 5 MACHINE_ARCH's affected, and all the other arch code touched.
it also includes some actual run-time testing of sparc, i386 and
shark, and i performed binary comparison upon amiga and x68k as well.


some minor details relevant:
- move shlib.[ch] from ld.aout_so into ldconfig proper, and cut them
down to only the parts ldconfig needs
- remove various unused source files
- switch amiga bootblocks to using elf2bb.h instead of aout2bb.h

branches: 1.6.2; 1.6.4;
Switch atari standalone bootloaders to using MI libsa and libkern.

Tested by David Ross on port-atari@. Thanks!

branches: 1.5.2;
Don't install built boot.atari loaders into / of DESTDIR because
there are two variants of boot.atari per machine types (std or milan)
and they should be selected and copied from /usr/mdec/{std,milan} dirs
to /targetroot during installation.

Problem on default installation with sysinst was reported by David Ross.

Fix PR port-atari/40315: Bootloader fails on Atari TT030
Add asm sources which provide a fixed entry point for raw bootxx and bootxxx
because modern aggressive gcc4 may reorder functions in the same source
and the first function in a C source won't always appear at the beginning
in its object.

Also overhaul various files in the stand directory:
- rename stand/Makefile.inc to stand/Makefile.booters and
explicitly include it from each Makefile because the stand
directory contains non standalone programs like installboot and
Makefile.inc will be included implicitly from all Makefiles in SUBDIRs
- put more common options into Makefile.booters so that
all boot programs use proper options (-Os etc.)
- make standalone boot programs compile without installed ${DESTDIR}:
- create machine and m68k symlinks in ${.OBJDIR} in all boot programs
- set appropriate make environments to suppress errors and warnings
- <string.h> isn't there in _STANDALONE case
- put #ifdef TOSTOOLS (looks equivarent with !_STANDALONE)
to some files in stand/tostools
- use ${LD} ${LINKFLAGS} rather than ${CC} ${LDFLAGS}
- create raw binaries on ${PROG} target rather than on beforeinstall
and stop weird renaming on beforeinstall and afterinstall
- print proper error message if bootxx size is larger than limit
- create ${DESTDIR}/usr/mdec/{milan,std} directories on beforeinstall
in all boot programs
(XXX: how can we put MD /usr/mdec/foo directories into src/etc/mtree?)
- prototype warnsfy
- cleanup Makefiles for readablity and remove unnecessary rules
- no need to use daddr_t in installboot because the AHDI label doesn't
support 64 bit block numbers

Tested by David Ross (PR submitter) on port-atari, and
finally NetBSD/atari on TT030 is now fully functional.

Should be pulled up to netbsd-4 (where gcc4 was initially imported)
and netbsd-5.

branches: 1.3.24; 1.3.74; 1.3.78; 1.3.86; 1.3.88;
merge ktrace-lwp.

Add -ffreestanding to CFLAGS, so that libsa prototypes do not conflict
with otherwise built-in functions and prototypes in the new gcc.

branches: 1.1.2;
usr/mdec reorg for Milan support.
Note that installboot needs reworking too. Installing bootblocks on -current
is no longer possible until this is done.
nolonger