Typically linker options are protected with -Xlinker or -Wl,
however certain sloppy Makefiles pass -z options directly to
the compiler. This patch enables clang to recognize these
options (because -z is not used by clang itself).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213198 91177308-0d34-0410-b5e6-96231b3b80d8