🍎 skip tabbing category if macOS < Sierra

Previously, the macro was ensuring the` MAC_OS_X_VERSION_10_12` was not defined to decide to compile a `NSWindow` category back porting native tabs or not.

This patch ensures to compile the `NSWindow` category only if the min required version is lesser than 1012 (`MAC_OS_X_VERSION_10_12`)

atom/browser/native_window_mac.mm

@@ -465,7 +465,7 @@ bool ScopedDisableResize::disable_resize_ = false;
 
 @end
 
-#if !defined(MAC_OS_X_VERSION_10_12)
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 1012 // MAC_OS_X_VERSION_10_12
 
 enum {
   NSWindowTabbingModeDisallowed = 2