Building Freetype with MinGW-64

A few technical notes, because this was harder than it needed to be due to development environment cruft.

1. Remove MSYS from your PATH.
2. Disable Windows Subsystem for Linux.
3. Remove old versions of GCC from your PATH.
4. Install MinGW-64 using WinBuilds.
   a. The package URL was incorrect. If needed, override it to http://win-builds.org/1.5.0/packages/windows_64/ .
5. Copy mingw32-make.exe to make.exe in winbuilds\bin. This may not be strictly necessary, but I'm disinclined to experiment at this point.
6. Open CMake. Point to the source code and build target.
7. Configure. Will succeed if paths are set properly.
8. Set installation path.
9. Open Terminal in build target directory (reminder: Shift+RMB).
10. make
11. make install