Implement -print-file-name=include (which is undocumented but used by some Linux boot loaders).  This option prints out the directory holding the include files needed by a freestanding program.  The default implementation of this doesn't work on FreeBSD because of the different include file layout.  But it's easy to implement: just return /usr/include (or the cross-compiling equivalent).
Implement -print-file-name=include (which is undocumented
but used by some Linux boot loaders).  This option prints
out the directory holding the include files needed by
a freestanding program.  The default implementation of
this doesn't work on FreeBSD because of the different
include file layout.  But it's easy to implement:
just return /usr/include (or the cross-compiling equivalent).

Reviewed by:	kan
MFC after:	1 week

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