(core_info.c) Check first if supported_extensions_list is not NULL before
freeing
(cc_resampler.c) Remove some unneeded header includes / make it more
backwards compatible
(CC resampler) Add RARCH_INTERNAL check
Split up rglgen header includes to separate header file
Merge branch 'improve_texturing':
OpenGL mipmap support for LUT textures is ready for upstream inclusion.
Merge pull request #674 from TroggleMonkey/master

LUT texture filtering improvements, etc.
Add inclusion of gfx/shader_common.c to other Makefiles
(shader_common.c) Some build fixes for PS3
(PSGL) Force mipmap to false for now for PSGL
(PS3) Missed semicolon