centralize vers.c building for standalone programs.

branches: 1.14.6; 1.14.10; 1.14.14;
Add empty LIBCRTI= as LIBCRT0 to build sa programs without installed DESTDIR.

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

Explicitly link srt0.o (Standalone RunTime startup code) first.

Taken from the similar fix of mvme68k:
http://mail-index.netbsd.org/source-changes/2013/09/21/msg047819.html
> MVME PROM requires raw binaries (by objcopy -O binary) so we have to
> make sure the entry point is located at the first address of the binaries.
The original changes to switch to using MI libsa is:
http://mail-index.netbsd.org/source-changes/2011/01/02/msg016563.html

Should be pulled up to netbsd-6 branches.
(though untested since there seems no users of mvmeppc)

branches: 1.12.4; 1.12.10; 1.12.14; 1.12.16; 1.12.18; 1.12.24;
Drop bootprog_maker (formerly enabled by -M) and bootprog_date (formerly
disabled by -D) from the output of newvers_stand.sh. Change -D to the
inverted logic, so that it adds the date to bootprog_rev in ().

Change all platforms accordingly. -D is added if MKREPRO is not yes and
wasn't present before. Platforms that didn't use -D don't depend on
MKREPRO now either.

branches: 1.11.2; 1.11.4;
Switch mvmeppc bootloader to using MI libsa and libkern for maintainability.
Mostly taken from mvme68k.

Compile test only, but no functional changes.

branches: 1.10.4;
Use <bsd.klinks.mk> to create machine and ${MACHINE_CPU} symlinks.

Pull a fix from mvme68k:
Create machine and ${MACHINE_CPU} symlinks properly and
remove unnecessary dependencies so that parallel build works.

Remove obsolete LIBSA_USE_MEMCPY and LIBSA_USE_MEMSET.
They were removed from <lib/libsa/stand.h> on December 2007.

branches: 1.7.2;
- add some make variables to suppress errors on build without DESTDIR
- make sure machine and ${MACHINE_ARCH} symlinks are always created

branches: 1.6.74; 1.6.78; 1.6.86;
merge ktrace-lwp.

Factor out the C preprocessor defines and include flags from CFLAGS
to CPPFLAGS, so that they are also applied when compiling assembler
files.

Use ${HOST_SH} instead of `sh'.

If necessary, pull in <bsd.sys.mk> to get the definition of HOST_SH;
Makefiles that pull in one of (most of) <bsd.*.mk> will get this anyway.

use -ffreestanding

branches: 1.2.2; 1.2.8;
Use ${PRINTOBJDIR} rather than rolling our own. This makes parallel
builds work properly.

branches: 1.1.2; 1.1.10;
New port: NetBSD/mvmeppc

Based mostly on NetBSD/prep at this time since the earlier mvme160x
boards are pretty much PReP compliant. Later boards in the range
diverge somewhat from the reference platform, hence the separate port.

Still needs *lots* of bashing into shape, but at this time it will
boot to multi-user over ethernet on an MVME1603-051.