make SSP build work again

various updates to build native GCC 12.

- for usr.bin, build libcody and link it into cc1*plus
- move makefile code for auto-build.h and version.h (was gcov-iov.h)
into makefile fragment to share

various updates to build native GCC 12.

- for usr.bin, build libcody and link it into cc1*plus
- move makefile code for auto-build.h and version.h (was gcov-iov.h)
into makefile fragment to share them. (XXX probably best to only do
this in one place, but that's a future step.)
- many updates to handle the .c -> .cc renames
- build some x86 files with -msse2
- bump shlib versions for libgomp and libstdc++v3
- fix MKGCCCMDS=no builds
- updates for new rtl-ssa subdir
- use -std=gnu++11 for various places
- define TARGET_MACHINE and HOST_MACHINE for some places
- avoid a .BEGIN rule that writes to missing obj (ie src) sometimes

cleanups still needed:
- remove a bunch of commented -Wno* that don't seem to be needed anymore
- leave or remove various vax-specific -O0s that should no longer be
necessary for the vax-gcc port
- some "XXXGCC12" that should be may be fixable or converted to using our
standard ${CC_...} warnings (but may need to remain, in which case the
XXXGCC12 marker will be removed.)

with these, and a few other changes around the tree, i've able to build
gcc12 releases for several ports that seem to work (arm64, sparc, amd64,
i386 at least so far, have run, several others have built.)

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make GCC 9.3.0 build itself:
- common-target is needed before common now
- complete build-sort.o framework
- fix cyclic dep
- fix .c vs .cc issues

port reachover framework to GCC 9.

fix stack protector build

- move various stuff into Makefile.prog
- make sure VER_CPPFLAGS is applied to all required files
- add ADD_FRONTEND_LIBRARY to avoid linking libfrontend, while
using the rest of this fragment

Use bsd.init.mk (instead of bsd.own.mk) consistently so that
Makefile.inc gets called before bsd.own.mk so that we get a chance
to use NOFOO easily in Makefile.inc. Use that to turn CTF off for
every

Use bsd.init.mk (instead of bsd.own.mk) consistently so that
Makefile.inc gets called before bsd.own.mk so that we get a chance
to use NOFOO easily in Makefile.inc. Use that to turn CTF off for
everything.

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find gcov.1 again.

Get GCC 4.8 closer to build with "USE_SSP" set to "yes".

merge GCC 4.8 build.

Fix remaining SSP build issues if GCC 4.5 is used.

this needs -lintl now.

move the gcc 4.5 usr.bin build makefiles to the right place.