[automerger skipped] Merge "Add libwinpthread-1.dll to windows sdk, copied from clang-r365631b" am: 67ca6e03dd am: e2e07bc578 -s ours

am skip reason: Change-Id I53ff5f9769aa527cd340bc08cb494005428fc646 with SHA-1 4f5f0234b6 is in history

Change-Id: I9fe7d837f3ebe5fb4d81542de9689f6e3da2cb60