K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2018-04-07T00:29:42.686742Z
K 7
svn:log
V 438
Bring over some fixes from the other external GCC toolchain ports.

This is generally inspired by the changes in r465416 and subsequent fixes.

- Remove include-fixed headers.
- Strip /usr/local/include from the default include path.
- Use libc++ for C++ instead of libstdc++.
- Force build of a cross compiler if built on a riscv64 host.
- Bump PORTREVISION.

Reviewed by:	lwhsu
Differential Revision:	https://reviews.freebsd.org/D14787

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