portal sky mod v 1.35
Precompiled headers unbound

rebased

added missing Sys_GetSystemMem

removed jpeg-6, replaced by jpeg-6b

typo fixed

fixed conditional tools building

cmakelist cleaned from precompiled

removed hardly useful Sys_GetSystemRam()

fixed ffmpeg includes for unix

frame.h deprecated on modern libavutil
Merge branch 'portal_sky' of https://github.com/BielBdeLuna/RBDOOM-3-BFG
jpeg and png are now built optionally
classics fixed
frame.h for older ffmpeg
ffmpeg r_frame_rate -> avg_frame_rate
steam api specific calls fixed
steam api leaderboards made optional
Removed include of SDL_syswm.h because it creates problems on Kubuntu 14.04 with Mir
Removed ARB endings from OpenGL calls
Added check for Gallium drivers to use GLSL ES 3.00. #137
steam api disabled
png custom io hander var renamed
sdl includes simplified
ffmpeg includes simplified
Make it work with SDL2

cmake will set a -I/path/to/include/SDL cflag, so we can #include <SDL.h>
directly (which even works for both SDL1.2 and SDL2 then)
Merge branch 'rmPrecompiledHeaders'

Conflicts:
	neo/sys/posix/posix_main.cpp
	neo/sys/sdl/sdl_glimp.cpp