debian: update Control with latest GSdx requirement. Update Readme with latest openGL extensions


git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5686 96395faa-99c1-11dd-bbfe-3dabce05a288
gsdx: use size_t for loop index when it used countof macro
* fix override_GL_ARB_copy_image typo


git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5687 96395faa-99c1-11dd-bbfe-3dabce05a288