cmake: cannot detect deprecated apple-clang link options (they are not fatal)

So skip these

CMakeLists.txt

@@ -673,12 +673,7 @@ if(USE_GCC OR USE_CLANG OR USE_INTELCC OR USE_QCC)
     endif()
   endif()
 
-  if(APPLE)
-    check_linker_flag(C "-Wl,-undefined,error" LINKER_SUPPORTS_WL_UNDEFINED_ERROR)
-    if(LINKER_SUPPORTS_WL_UNDEFINED_ERROR)
-      sdl_shared_link_options("-Wl,-undefined,error")
-    endif()
-  elseif(NOT OPENBSD)
+  if(NOT OPENBSD)
     cmake_push_check_state()
     check_linker_flag(C "-Wl,--no-undefined" LINKER_SUPPORTS_WL_NO_UNDEFINED)
     #FIXME: originally this if had an additional "AND NOT (USE_CLANG AND WINDOWS)"