Fix Windows build, don't try to #include <pthread.h> when we know it's not
available.

llvm-svn: 144574
1 file changed
tree: d3144dab6e69cee40991f265e5a8936f275dac8e
  1. clang/
  2. compiler-rt/
  3. debuginfo-tests/
  4. libcxx/
  5. libcxxabi/
  6. lldb/
  7. llvm/
  8. polly/