[libFuzzer] Fix libFuzzer flag propagation for standalone builds.

Under the previous configurations, flags from SANITIZER_COMMON were not
propagated for standalone builds.

Differential Revision: https://reviews.llvm.org/D37225

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@311912 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed