Clean up of the input selected for the opengl x window in linux.
Fix a potential segfault when taking a screenshot (happens consistently when using "Save Targets" from the video debugger window).
Fix a memory corruption error that results from the wrong image size being passed when dumping textures.
Make the screenshot hotkey configurable.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6067 8ced0084-cf51-0410-be5f-012b33b47a6e