[gtkmm] Fix a typo that shows in windows build

[Fridrich Strba <strba src gnome org>]

commit 66030289679dc04fce14809952dfac082e6217c2
Author: Fridrich Å trba <fridrich strba bluewin ch>
Date:   Wed Sep 15 14:11:52 2010 +0200

    Fix a typo that shows in windows build

 gdk/src/display.hg |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/src/display.hg b/gdk/src/display.hg
index 4db751f..58bd1ac 100644
--- a/gdk/src/display.hg
+++ b/gdk/src/display.hg
@@ -163,7 +163,7 @@ public:
    * may be @a xid or the X id of a proxy window, or None if @a xid doesn't
    * support Drag and Drop.
    */
-  WRAP_METHOD(GdkNativeWindow get_drag_protocol(GdkNativeWindow xid, GdkDragProtocol& protocol), gdk_drag_get_protocol_for_display)
+  _WRAP_METHOD(GdkNativeWindow get_drag_protocol(GdkNativeWindow xid, GdkDragProtocol& protocol), gdk_drag_get_protocol_for_display)
 #endif
 
   _WRAP_METHOD(GdkKeymap* get_keymap(), gdk_keymap_get_for_display)