bapt 4282bf75f6 Fix building of llvm's unwind if gcc has been also built
when building gcc an unwind.h header is generate in the cc_tool directory
which is included in the CFLAGS before the path where the llvm's unwind.h file
lives

Reviewed by:	emaste
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D7357
2016-10-20 21:12:50 +00:00
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