No more needed to use -i to disable icon padding

Now xmenu detects if a menu has an icon, and if it doesn't have, the
menu will not have the gaps fgor icons, making the -i flag unecessary
to disable the padding.   The -i option is still necessary, however,
to speed up xmenu loading, since it disables imlib2 initialization
routines.

xmenu.h

@@ -84,6 +84,7 @@ struct Menu {
 	struct Item *list;      /* list of items contained by the menu */
 	struct Item *selected;  /* item currently selected in the menu */
 	int x, y, w, h;         /* menu geometry */
+	int hasicon;            /* whether the menu has item with icons */
 	int drawn;              /* whether the menu was already drawn */
 	unsigned level;         /* menu level relative to root */
 	Window win;             /* menu window to map on the screen */