[vala/0.40] girwriter: Add c:identifier-prefixes to <namespace>

[Rico Tzschichholz <ricotz src gnome org>]

commit 575bb68853ddb950337b46c09cc5621e37f49766
Author: Jean Pierre Dudey <me jeandudey tech>
Date:   Sun Jul 19 13:32:07 2020 -0500

    girwriter: Add c:identifier-prefixes to <namespace>
    
    c:prefix is deprecated and c:identifier-prefixes should be used.

 codegen/valagirwriter.vala | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/codegen/valagirwriter.vala b/codegen/valagirwriter.vala
index 80c4b2132..90f2836fa 100644
--- a/codegen/valagirwriter.vala
+++ b/codegen/valagirwriter.vala
@@ -342,6 +342,7 @@ public class Vala.GIRWriter : CodeVisitor {
                }
                if (cprefix != null) {
                        buffer.append_printf (" c:prefix=\"%s\"", cprefix);
+                       buffer.append_printf (" c:identifier-prefixes=\"%s\"", cprefix);
                }
                buffer.append_printf (">\n");
                indent++;