cmake HAS_FALLTHROUGH_OPTION examples

bbidulock/icewm src/CMakeLists.txt :94 

CHECK_CXX_COMPILER_FLAG(-Wimplicit-fallthrough=2 HAS_FALLTHROUGH_OPTION)

bbidulock/icewm src/CMakeLists.txt :98 

CHECK_CXX_COMPILER_FLAG(-Wimplicit-fallthrough HAS_FALLTHROUGH_OPTION)