FreeBSD 10 and above no longer have /usr/bin/cvs - allow it to be found in the path (e.g., from a devel/cvs ports install)
Fix the link path for GDB expat test.

If doing a Cxc add the ld flags to the CC to allow the expat to
build. This broke with the change to support clang on Mavrick.
4.11/sparc/gdb: Use SIS patch to fix gdb outout and run fail.