[gnome-applets/wip/muktupavels/werror] mini-commander: fix -Wdiscarded-qualifiers warnings

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 6b42a1da309125b054af4c33b61c5d71937868c4
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 4 22:13:15 2020 +0300

    mini-commander: fix -Wdiscarded-qualifiers warnings

 gnome-applets/mini-commander/mini-commander-applet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gnome-applets/mini-commander/mini-commander-applet.c 
b/gnome-applets/mini-commander/mini-commander-applet.c
index 87df0a855..2ce8e0f8a 100644
--- a/gnome-applets/mini-commander/mini-commander-applet.c
+++ b/gnome-applets/mini-commander/mini-commander-applet.c
@@ -71,7 +71,7 @@ static const GActionEntry mini_commander_menu_actions [] = {
 };
 
 typedef struct {
-    char *stock_id;
+    const char  *stock_id;
     const char **icon_data;
 } CommandLineStockIcon;