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.

regen for mknative and all platforms. there are a few things
fixed in this, mostly related to tgmath.h or frexp, and some
generated vs hand-edited white space diffs.

Switch the iconv(3) prototype to the POSIX conformant variation

Remove const from the 2nd argument.

const char ** and char ** are incompatible types and it was a cost to keep
the technically incomp

Switch the iconv(3) prototype to the POSIX conformant variation

Remove const from the 2nd argument.

const char ** and char ** are incompatible types and it was a cost to keep
the technically incompatible form for a more purist variation. NetBSD was
almost the last alive OS to still keep the const argument (known leftovers:
Minix and Illumos).

Keep the const form for the internal purposes inside citrus and rump.

Address the build breakage fallout in the same change.

There are no ABI changes.

Change accepted by core@.

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mknative-gcc and GCC 7 and sun2.

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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mknative-gcc for m68k and m68000 and GCC 5.3.

merge GCC 4.8 build.

(re-)generate mknative-gcc files for many platforms.
(re-)generate the gmp files for many platforms.