change .gitignore
Add CheckLib.cmake
Add cleaner svnrev.h code, add macros
Use CheckLib for some libs
Remove unneeded Check*.cmake
Remove unneeded comments
cmake: Use previous macros in CMakeLists.txt files

Gregory: add a c lib for zzogl-pg-cg replayer
Look for GLESv3 header instead of GLESv2 header
Merge branch 'uyjulian-CleanCMake'