Remove redundant ifdef check.
Update glgen_gl.c/h.
Greatly improve performance with normalized overlays and threaded video.

SET_ALPHA_MOD would previously block on frame completion which only made
sense for non-normalized overlays.

This should also hopefully fix the ANR hang on Android.
Avoid temporary garbage data in alpha mod.
(PSP) Video driver was not hooked up
(PSP) Add example for manually loading a ROM file so that we can
skip past the menu
Merge pull request #545 from libretro/glgen-update

Update glgen_gl.c/h.
(PSP) Hook up frontend platform driver - implement process_args
and not exec function
(OSX) Add GLuint64EXT for OSX version lower than 10.7 (Lion)
(PSP) Build fix
(glsym_gl.h) Update GLuint64EXT in glsym_gl.h too (BTW - where
is the README explaining how to generate files with glgen.py?)
Add glsym README.
Remove weird backslash.
Fix command-line for glgen.
(PSP) Gives video output now
(PSP) Take out instant exit hack
(PSP) Dehardcode pitch parameter to sceGuCopyImage
(PSP) Refactor PSP input driver to make use of new gamepad interface
(PSP) Input - Don't check for return value from CtrlReadBufferPositive - make
input init function properly return a struct
(PSP) Ifdef psp_video_restart with HAVE_MENU