cmake HAVE_GLES2 examples

ZDoom/gzdoom CMakeLists.txt :235 

option (HAVE_GLES2 "Enable GLES2 support" ON)

prusa3d/PrusaSlicer deps/+OCCT/occt_toolkit.cmake :323 

add_definitions (-DHAVE_GLES2)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/gzdoom/CMakeLists.txt :258 

option (HAVE_GLES2 "Enable GLES2 support" ON)