[vala/0.36] glib-2.0: Bind strcmp0 as GLib.CompareFunc<string?>

[Rico Tzschichholz <ricotz src gnome org>]

commit afdca26888866d0e95e84e8b88532c8a17db9e91
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Jul 1 11:10:35 2019 +0200

    glib-2.0: Bind strcmp0 as GLib.CompareFunc<string?>
    
    Allows proper usage with experimental non-null
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/810

 vapi/glib-2.0.vapi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
index 5ff382126..069e1b325 100644
--- a/vapi/glib-2.0.vapi
+++ b/vapi/glib-2.0.vapi
@@ -4540,7 +4540,7 @@ namespace GLib {
 
        [Version (since = "2.16")]
        [CCode (cname = "((GCompareFunc) g_strcmp0)")]
-       public static GLib.CompareFunc<string> strcmp;
+       public static GLib.CompareFunc<string?> strcmp;
 
        public delegate G CopyFunc<G> (G src);