CMakeLists: use -fobjc-arc only with clangs

Author: barracuda156

CMakeLists.txt

@@ -60,7 +60,9 @@ if(WIN32)
     endif()
   endif()
 elseif(APPLE)
-  target_compile_options(clip PRIVATE -fobjc-arc)
+  if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    target_compile_options(clip PRIVATE -fobjc-arc)
+  endif()
 
   find_library(COCOA_LIBRARY Cocoa)
   if(COCOA_LIBRARY)