am 07a11d31: Merge "Switch to hermetic GCC 4.8.3-based x86_64-w64-mingw32-4.8 compiler." into lmp-dev

* commit '07a11d31f0baa355f9c3da60f965a56ff1d125e5':
  Switch to hermetic GCC 4.8.3-based x86_64-w64-mingw32-4.8 compiler.