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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merge gcc 7.4 into gcc.old part 3 (last?)

delete GCC 6.5. every platform has been on GCC 7 for a while now.

merge GCC 5.4 into gcc.old.

Remove gcc.old now it is no longer used.

re-merge GCC 4.8.5 (part 1).

delete GCC 4.5.

import the -current GCC 4.5 sources as gcc.old in preparation for
upgrading the normal GCC to 4.8.

this tree has had ChangeLog entries removed, as well as all the
other components we delete, and "on

import the -current GCC 4.5 sources as gcc.old in preparation for
upgrading the normal GCC to 4.8.

this tree has had ChangeLog entries removed, as well as all the
other components we delete, and "only" weighs in around 140MB now.

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