Remove unused code from Find*.cmake modules. All logic with USE_PREBUILT_LIBS are handled in cmake/Modules/CocosUsePrebuiltLibs.cmake
Merge pull request #9580 from CocosRobot/update_lua_bindings_1419235211

[AUTO]: updating luabinding automatically
Merge pull request #9569 from vovkasm/pull/cmake-cleanups

cmake: cleanups