K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2018-12-29T00:44:12.588678Z
K 7
svn:log
V 639
Simplify some of the logic for external GCC toolchain packages.

- Always define BU_PREFIX as GCC_TARGET if needed.  This was already
  effectively true, but BU_PREFIX was just being set to the same value
  in the case that GCC_TARGET wasn't defined.  This is simpler and
  avoids duplicating some logic.
- Simplify amd64-gcc by not defining GCC_TARGET and BU_PREFIX in that
  port but instead replacing "amd64" with "x86_64" in the
  devel/powerpc64-gcc Makefile.  This matches what base/gcc does.
- Remove FREEBSD_EXTENSION now that it is no longer needed.

Approved by:	zeising
Differential Revision:	https://reviews.freebsd.org/D18349

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