merge GCC 10.5.0 in gcc.old

merge GCC 10.4 into gcc.old.

merge GCC 9.3 into gcc.old.

merge GCC 8.4 into gcc.old.

regen mknative files for GCC 7.5.

Enable EOWNERDEAD & ENOTRECOVERABLE in libstdc++

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 6.5.0 into gcc.old.

merge in missing changes from gcc to gcc.old (both GCC 6.4.):

--
redo mknative-gcc for all ports. main changes include:
- "#define HAVE_CC_TLS 1" for most/all ports, thanks maya@
- "#define _GLIBCX

merge in missing changes from gcc to gcc.old (both GCC 6.4.):

--
redo mknative-gcc for all ports. main changes include:
- "#define HAVE_CC_TLS 1" for most/all ports, thanks maya@
- "#define _GLIBCXX_HAVE_LDEXPL 1" and "#define _GLIBCXX_HAVE_TGMATH_H 1"
for many ports
- arm64 and amd64 had a broken c++config.h that disabled many things
- configargs.h has more normalisation
- ppc64 has a few things fixed, must have missed several mknative rounds
--
regen to pull out INTERNAL_CFLAGS.
--
pull -DHAVE_CC_TLS out of $(INTERNAL_CFLAGS) if it is there, and add
it to CPPFLAGS.

this fixes PR#53567 for me.

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merge GCC 6.4 into gcc.old.

regen for GCC 5.5.

re-run mknative to disable the libstdc++ "dual abi". Bump.

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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