cmake HAVE_GLES2_GL2PLATFORM_H examples

tanis2000/binocle-c src/deps/sdl/test/CMakeLists.txt :357 

check_include_file("GLES2/gl2platform.h" HAVE_GLES2_GL2PLATFORM_H)

mxcop/src-dgi extern/sdl/test/CMakeLists.txt :349 

check_include_file("GLES2/gl2platform.h" HAVE_GLES2_GL2PLATFORM_H)