mknative-gcc for GCC 12.3.0 on arm64*, arm* besides armv4, ppc, alpha,
sh, sparc*, mips*, riscv*, vax, hppa, ia64, and m68*.

earmv4 didn't start properly, and powerpc64 failed to build, but all
the

mknative-gcc for GCC 12.3.0 on arm64*, arm* besides armv4, ppc, alpha,
sh, sparc*, mips*, riscv*, vax, hppa, ia64, and m68*.

earmv4 didn't start properly, and powerpc64 failed to build, but all
the rest seem to be OK now.

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mknative-gcc for GCC 10 and almost all platforms. one of the
myriad of arm platforms, and the powerpc* platforms are not
yet done.

mknative-gcc for gcc 9.3.0 and arm64, alpha, hppa, ia64, m68*, mipseb,
powerpc, riscv*, sh3*, sparc*, vax.

move data from README.gcc8 to README.gcc9.

mknative-gcc for GCC 8.3 and all ports.

mknative-gcc for alpha, hpaa, ia64, mips*, sh3*, and vax.
re- for powerpc, sparc, i386, and amd64.

regenerate everything for GCC 6.5.

sh3eb and sh3el had a problem wtih libstdc++ i had to work around for now.

rebuild mknative GCC 6.4 for these targets:
arm armeb earmeb earmhf earmhfeb earmv4eb
earmv6 earmv6eb earmv6hf earmv6hfeb
earmv7 earmv7eb earmv7hf earmv7hfeb
hppa ia64 m68000 m68k
mips64eb mips6

rebuild mknative GCC 6.4 for these targets:
arm armeb earmeb earmhf earmhfeb earmv4eb
earmv6 earmv6eb earmv6hf earmv6hfeb
earmv7 earmv7eb earmv7hf earmv7hfeb
hppa ia64 m68000 m68k
mips64eb mips64el mipseb mipsel
powerpc64 sh3eb sh3el vax

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regen vax!

merge GCC 4.8 build.

build and install libgomp, as needed by "cc -fopenmp", and its
suplimentary files like libgomp.spec and omp.h.