Fix vout window capability name

(Now agrees with module_need)

modules/gui/maemo/maemo.c

@@ -69,7 +69,7 @@ vlc_module_begin();
     add_shortcut( "maemo" );
 
     add_submodule();
-        set_capability( "vout window", 50 );
+        set_capability( "vout_window", 50 );
         set_callbacks( OpenWindow, CloseWindow );
 vlc_module_end();
 

modules/gui/qt4/qt4.cpp

@@ -225,7 +225,7 @@ vlc_module_begin ()
         set_callbacks( OpenDialogs, Close )
 #if 0 /* this is totally broken */
     add_submodule ()
-        set_capability( "vout window", 50 )
+        set_capability( "vout_window", 50 )
         set_callbacks( WindowOpen, WindowClose )
 #endif
 vlc_module_end ()

modules/gui/skins2/src/skin_main.cpp

@@ -490,7 +490,7 @@ vlc_module_begin ()
     add_shortcut( "skins" )
 
     add_submodule ()
-        set_capability( "vout window", 51 )
+        set_capability( "vout_window", 51 )
         set_callbacks( WindowOpen, WindowClose )
 
     add_submodule ()

src/video_output/vout_intf.c

@@ -116,7 +116,7 @@ void *vout_RequestWindow( vout_thread_t *p_vout,
     wnd->pos_y = *pi_y_hint;
     vlc_object_attach (wnd, p_vout);
 
-    wnd->module = module_need (wnd, "vout window", 0, 0);
+    wnd->module = module_need (wnd, "vout_window", 0, 0);
     if (wnd->module == NULL)
     {
         msg_Dbg (wnd, "no window provider available");