Fuzzer: Fix library dependencies.

Newer versions of libstdc++ (4.9+), as well as libc++, depend directly on
libpthread from the standard library headers, so libfuzzer needs to declare
a standard library dependency.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255745 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed