Override - setDelegate: of PTYTabView with its parameter restricted to

the correct protocol

Fixes warning when setting the delegate of a PTYTabView to a
PSMTabBarControl, which correctly implements PTYTabViewDelegateProtocol,
but the correct override for setDelegate was missing in PTYTabView.

Headers/iTerm/PTYTabView.h

@@ -57,4 +57,7 @@
 // selects a tab from the contextual menu
 - (void) selectTab: (id) sender;
+// Override setDelegate so that it accepts PSMTabBarControl without warning
+- (void) setDelegate: (id<PTYTabViewDelegateProtocol>) anObject;
+
 @end