Merge pull request #160 from cxd4/master

fix segfault in wrong `pitchindwords' formula
(Angrylion) Don't call RETRO_ENVIRONMENT_SET_HW_RENDER when Anngrylion
is selected
Unnecessary - we need to do early returns inside the GL state machine's
functions when ANGRYLION is selected
Put wrapper function around vbo_draw
Only set gfx_plugin to Glide64 if no core option value has been set
for video plugin
Set gfx_plugin in update_variables
temp. bypass to double each scanline for non-interlaced DAC