[pan] Gtk2: require version 2.24

[Dominique Dumont <ddumont src gnome org>]

commit 231927780d6ff954062f893787e5c28e50523427
Author: Dominique Dumont <dod debian org>
Date:   Sun Jun 19 15:02:35 2022 +0200

    Gtk2: require version 2.24
    
    To cleanup ./pan/gui/gtk-compat.h file

 README.org | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.org b/README.org
index f2bee35..3c567f0 100644
--- a/README.org
+++ b/README.org
@@ -96,7 +96,7 @@ other than testing. Use at your own risk:
 The following librairies are deprecated and will be removed in future
 releases:
 
-- GTK 2 2.16.0 or higher
+- GTK 2: 2.24.0
 
 Run the following command to get a list of all options that you can
 enable or disable at configure (or autogen) time: