MFC r282973 (disable libgomp build) and r283060 (disable libgcov build)?

[Don Lewis]

Should r282973 and r283060 be MFCed to FreeBSD 10?  On amd64 and i386,
which use clang as their base compiler and don't have gcc in base by
default, the math/scilab port uses clang for cc and c++ compilation, but
finds /usr/include/omp.h (and links to libgomp from lang/gcc).  The
build succeeds, but I suspect this may not run properly.