[CMake] Handle options for OS X systems

CMakeLists.txt

@@ -100,7 +100,7 @@ endif()
 
 if( APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   # apple doesn't have 64bit versions of file opening functions, so add them
-  add_definitions("-Dfopen64=fopen -Dfseeko64=fseeko -Dfseek64=fseek -Dftell64=ftell -Dftello64=ftello")
+  add_definitions(-Dfopen64=fopen -Dfseeko64=fseeko -Dfseek64=fseek -Dftell64=ftell -Dftello64=ftello)
 endif()
 
 set(COLLADA_DOM_INCLUDE_INSTALL_DIR "include/collada-dom")