MXE fix for ppc64le

One of my favourite tools is MXE, which ably builds Windows applications on your platform of choice as shown in the screenshot, and offers many libraries and toolks such as SDL, SDL2, Qt and NSIS. (I use it for OverbiteNX, for example.) However, the current version does not build on ppc64le because the gcc cross-compiler needs a later patch for POWER8+ which wasn't backported. Now it's been backported. While waiting for the pull request to enter the main tree, you can pull from our Github fork if you want to try it now.

The Talos II really performs nicely in QEMU, even with pure TCG emulation of the x86. ReactOS boots very smoothly on it.