Detect bits when building with MinGW
Detect bits when building with MinGW

(cherry picked from commit 460f030b738eb055d915e246a61f7740fe14f57b)

pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1