Fix 10.4 build by removing MAC_OS_X_VERSION_10_5 symbol

Author: gregrobbins

Source/GDataDefines.h

@@ -113,7 +113,7 @@
 // reliance on NSEnumerator for 10.4
 //
 #ifndef GDATA_FOREACH
-  #if defined(TARGET_OS_IPHONE) || MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
+  #if defined(TARGET_OS_IPHONE) || MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
     #define GDATA_FOREACH(element, collection) \
       for (element in collection)
   #else