buildenv/1.3.x/win32-static: update Boost to 1.57.0.
buildenv/1.3.x/win32-static: update FLAC to 1.3.1.
buildenv/1.3.x/win32-static: update Qt to 5.4.0.
buildenv/1.3.x/win32-static: fix URL to protobuf 2.6.1 zip file.