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 alpha, earm, i386, mips64eb, powerpc, sparc,
sparc64, and x86-64. tree does not fully build yet, however.

merge GCC 4.8 build.

(re-)run mknative-gcc for i386, amd64, sparc, sparc64, powerpc and arm.

- both x86 seem to be working fine now
- sparc static binaries work, dynamic fails
- sparc64 fails at startup, accessing beyon

(re-)run mknative-gcc for i386, amd64, sparc, sparc64, powerpc and arm.

- both x86 seem to be working fine now
- sparc static binaries work, dynamic fails
- sparc64 fails at startup, accessing beyond the stack
- powerpc and arm still have libgcc issues

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