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.

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

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.

merge GCC 5.5.0 in gcc.old.

merge GCC 5.4 into gcc.old.

re-merge GCC 4.8.5 (part 1).

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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