Removes the redundant window on OSX
remove wx from agl
Add a OSX version check to GLSL so if anyone running < OSX 10.7 gets a message instead of crashing when running the game. Turn off DEBUG_GLSL.
Let's do this version check again.
Revert "remove wx from agl"

This reverts commit e63a5d85297b7fc31c89b13c2ba09aa7d2fd4294.
window_handle is also used at many other places, so just move it here isn't allowed