Change Details

Build the GCC core compiler (release 1 of mingw-w64-gcc).

Built and tested (in Wine) a C "Hello, World!" program (with both GCC and Clang), [a libstdc++ test](https://github.com/tpoechtrager/osxcross/blob/master/oclang/test_libcxx.cpp), [the godot export template](http://docs.godotengine.org/en/3.1/development/compiling/compiling_for_windows.html#cross-compiling-for-windows-from-other-operating-systems), a simple Rust cross-compilation "Hello, World!" app and a [Go cross-compiled sdl2 program](https://github.com/veandco/go-sdl2-examples/blob/master/examples/render/render.go) (which also required a locally built SDL2 package).

Build the GCC core compiler (release 1 of mingw-w64-gcct and tested (in Wine) a C "Hello, World!" program (with both GCC and Clang), [a libstdc++ test](https://github.com/tpoechtrager/osxcross/blob/master/oclang/test_libcxx.cpp), [the godot export template](http://docs.godotengine.org/en/3.1/development/compiling/compiling_for_windows.html#cross-compiling-for-windows-from-other-operating-systems), a simple Rust cross-compilation "Hello, World!" app and a [Go cross-compiled sdl2 program](https://github.com/veandco/go-sdl2-examples/blob/master/examples/render/render.go) (which also required a locally built SDL2 package).