Disable default main menu key equivalent hack

In performKeyEquivalent: do not pass the key equivalent to
defaultMainMenu since this breaks the menus on OS X 10.4.  Also, this
hack is not strictly needed now that window cycling is hardcoded (and a
"New Window" menu is always available on the dock menu) so it is just as
well that it is removed.

src/MacVim/MMAtsuiTextView.m

@@ -418,14 +418,6 @@ - (BOOL)performKeyEquivalent:(NSEvent *)event
     if ([[NSApp mainMenu] performKeyEquivalent:event])
         return YES;
 
-    // HACK! Give the default main menu a chance to handle the key down event.
-    // This is to ensure that the standard mappings (which are in the default
-    // main menu) are always available, also when the default Vim menus are
-    // used (these do not set any key equivalents!).
-    if ([[[MMAppController sharedInstance] defaultMainMenu]
-            performKeyEquivalent:event])
-        return YES;
-
     // HACK!  On Leopard Ctrl-key events end up here instead of keyDown:.
     if (flags & NSControlKeyMask) {
         [self keyDown:event];

src/MacVim/MMTextView.m

@@ -652,14 +652,6 @@ - (BOOL)performKeyEquivalent:(NSEvent *)event
     if ([[NSApp mainMenu] performKeyEquivalent:event])
         return YES;
 
-    // HACK! Give the default main menu a chance to handle the key down event.
-    // This is to ensure that the standard mappings (which are in the default
-    // main menu) are always available, also when the default Vim menus are
-    // used (these do not set any key equivalents!).
-    if ([[[MMAppController sharedInstance] defaultMainMenu]
-            performKeyEquivalent:event])
-        return YES;
-
     // HACK!  On Leopard Ctrl-key events end up here instead of keyDown:.
     if (flags & NSControlKeyMask) {
         [self keyDown:event];