K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2020-08-17T20:11:43.553324Z
K 7
svn:log
V 620
Add a USE_GCC_TOOLCHAINS knob to make universe.

This uses GCC toolchains instead of LLVM on architectures supported by
GCC.  Currently this uses GCC 6 on aarch64, amd64, i386, and mips.

Although this does also try to use GCC 6 on powerpc, it is always
skipped for now since a powerpc-gcc6 package is not available and the
structure of make universe makes it hard to skip a subset of arches
for a target.  This should be short-lived as freebsd-gcc9 does include
a powerpc-gcc9 package so powerpc should work once this switches to
GCC 9.

Discussed with:	emaste
Differential Revision:	https://reviews.freebsd.org/D25732

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