Improve OS X target conditional macro.

Author: nlutsenko

Parse/PFConstants.h

@@ -465,7 +465,7 @@ extern NSString *const __nonnull PFNetworkNotificationURLResponseBodyUserInfoKey
 #endif
 
 #ifndef PF_TARGET_OS_OSX
-#  define PF_TARGET_OS_OSX TARGET_OS_MAC && !TARGET_OS_IOS && !TARGET_OS_WATCH && !TARGET_OS_TV
+#  define PF_TARGET_OS_OSX (TARGET_OS_MAC && !TARGET_OS_IOS && !TARGET_OS_WATCH && !TARGET_OS_TV && !TARGET_IPHONE_SIMULATOR)
 #endif
 
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