gcc 10 is now in gcc.old, make mknative-gcc.old gcc-10 happy.

make mknative-gcc.old for GCC 9. begin to update mknative-gcc for GCC 10.

pass down earm* not earmv5* to mknative-gcc.

set _OUTDIRBASE depending on $0, and then set _OUTDIR based on this.
now you can copy mknative-gcc to mknative-gcc.old without edit.

mknative-gcc is for GCC 8.4.
mknative-gcc.old is supposed to be for GCC 7, but is the GCC 6
version. update it and mark it for GCC 7.5.

copy across GCC 6.4 mknative-gcc into mknative-gcc.old.

use the variable for the source dir instead of duplicating it.

- gcc.old == gcc-5.3, so copy mknative-gcc{,.old} and adjust
- disable dual libstdc++ abi per joerg
(https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html)
will require a major libs

- gcc.old == gcc-5.3, so copy mknative-gcc{,.old} and adjust
- disable dual libstdc++ abi per joerg
(https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html)
will require a major libstdc++ major bump.

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set _OUTDIR and _OUTDIRBASE properly for gcc.old, and fix a sed.

prepare for GCC 5:
- remove GCC 4.5 stuff, add most very basic GCC 5 stuff.
- use mknative-gcc.old for GCC 4.8
- copy mknative-gcc to mknative-gcc.old (should have done this when we
switched to usi

prepare for GCC 5:
- remove GCC 4.5 stuff, add most very basic GCC 5 stuff.
- use mknative-gcc.old for GCC 4.8
- copy mknative-gcc to mknative-gcc.old (should have done this when we
switched to using gcc.old.)

this should not affect current builds.

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prepare for moving GCC 4.5 into gcc.old:

- convert to using ${EXTERNAL_GCC_SUBDIR}
- define base-external-gpl3-gcc* subdir as GCC_SUBDIR
- use <bsd.init.mk> over <bsd.own.mk> for a bunch of places;

prepare for moving GCC 4.5 into gcc.old:

- convert to using ${EXTERNAL_GCC_SUBDIR}
- define base-external-gpl3-gcc* subdir as GCC_SUBDIR
- use <bsd.init.mk> over <bsd.own.mk> for a bunch of places; mostly
because it arranges for ../Makefile.inc to be included earlier, and
don't bother including the latter if the former is already included.
- move all .PATH: settings after <bsd.{own,lib}.mk> so that all
valid variables are set before it is evaluated
- rename mknative-gcc* to match their subdir name.

XXX the relationship between the Makefile.inc/Makefile.gcc_path files
is kind of sketchy, it would be great if this was fixed.

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