mknative-gcc for gcc 9.3.0 and arm, earmv[467]*, i386, mipseb, mips64*,
and powerpc64.

regen mknative for all arm after christos fixes.

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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regen for earmv4 and GCC 7.

mknative gcc 6.4 and powerpc / earmv4. earmv4 seems to work.
powerpc not properly tested yet, but builds.

generate mknative-gcc for GCC 5.3 and all the arm targets.
minor regen for x86 and sparc*

merge GCC 4.8 build.

gcc configury for earmv4, earmv6, earmv6hf, earmv7, earmv7hf