patch 9.1.0066: gcc complains about use of uninitialized var

Problem:  gcc complains about use of uninitialized var
          (Tony Mechelynck, after 9.1.0064)
Solution: initialize button to silence gcc

Signed-off-by: Christian Brabandt <[email protected]>

Author: chrisbra

src/gui_gtk_x11.c

@@ -1985,7 +1985,7 @@ button_press_event(GtkWidget *widget,
 		   GdkEventButton *event,
 		   gpointer data UNUSED)
 {
-    int button;
+    int button = 0;  // silence gcc
     int repeated_click = FALSE;
     int x, y;
     int_u vim_modifiers;

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    66,
 /**/
     65,
 /**/