No real changes, just slightly simplify HasAppKit_10_6() function.

Remove redundant check for version == -1.

See #13831.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71544 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/cocoa/filedlg.mm

@@ -70,10 +70,8 @@ bool HasAppKit_10_6()
         // case above.
         version = NSVersionOfRunTimeLibrary("AppKit");
     }
-    if (version == -1)
-    {
-        return false;
-    }
+
+    // Notice that this still works correctly even if version is -1.
     return version >= 0x40e2400 /* version of 10.6 AppKit */;
 }