cmake HAVE_FVISIBILITY_INTERNAL examples

DynamoRIO/dynamorio CMakeLists.txt :1118

CHECK_C_COMPILER_FLAG("-fvisibility=internal" HAVE_FVISIBILITY_INTERNAL)

DynamoRIO/drmemory CMakeLists.txt :440

CHECK_C_COMPILER_FLAG("-fvisibility=internal" HAVE_FVISIBILITY_INTERNAL)