Fix OpenGL3 core profile support

GL_LUMINANCE_ALPHA is not present when using a core profile
Remove support for deferred rendering

Existing support is broken in various ways and performs worse than forward rendering
call R_SyncRenderThread in RE_UploadCinematic
Call SetRequiredVertexPointers after setting the color modulate uniform
Fix for use with libgeoip < 1.5.1.
Console scrolling fixes.
‘Fix’ FXAA on Mesa (Intel, GLSL 1.2).
Fix compilation with OPENAL disabled
Enable OpenAL support by default

This was accidentally changed in commit 3ce044a
Keep main/scripts/medistat.shader up to date with release.