Merge third_party/usrsctp/usrsctplib from https://chromium.googlesource.com/external/usrsctplib.git at 08245541310fc8c27b1cacc9924e8b6f6ab6c1f8

This commit was generated by merge_from_chromium.py.

Change-Id: I0ff4bd8d2928973f866b31cf268fa1e274dea24c