K 10
svn:author
V 8
bdrewery
K 8
svn:date
V 27
2018-06-27T16:56:46.672668Z
K 7
svn:log
V 517
Rework check for libclang_rt to see if the needed library exists.

Currently libclang_rt is not provided for cross-building and as such
is not connected to cross-tools.  For building clang once in universe
it is likely that libclang_rt won't exist for the universe toolchain
but even if it did it would not support anything but the native arch.
So explicitly check for support before enabling h_raw.

MFC after:	1 week
Reviewed by:	dim
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D16012

END