NetBSD/src cl9AY2O — external/gpl3/gcc/lib Makefile.gthr, external/gpl3/gcc/lib/libgomp Makefile
- fix Makefile.gthr CONFIG_LINKS handling. demand only that
gthr-default.h source be found. fix installing the symlink.
- -Wno-error=incompatible-pointer-types needed for libgomp/lock.c
- build new libsupc++ files with -std=gnu++1z
- install new libstdc++ bits files. (XXX use bits_sup_headers
from libstdc++/include/Makefile.am with mknative-gccm)
- start to get libstdc++ to build: various flag updates.
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