Add PPC Cross Compiler

See here for more info: http://www.gc-linux.org/wiki/Building_a_GameCube_Linux_Kernel_%28ARCH%3Dpowerpc%29
Update to 3.12.4
Apply base mikep7-patch-3.12.y-gc-wii kernel patch

Adds GameCube/Wii support
Revert recent Wii SDHCI changes until bugs are fixed
Add optional vfb-defio wii patch

See here for more info: http://fartersoft.com/blog/2011/07/31/hacking-up-an-rgb-framebuffer-driver-for-wii-linux-take-two