[gtk] gtk.supp: add a FcDefaultSubstitute exception

[Timm Bäder <baedert src gnome org>]

commit 9bddc0ff85b28652bb98149a483eb34121548a89
Author: Timm Bäder <mail baedert org>
Date:   Sun Jul 21 09:07:27 2019 +0200

    gtk.supp: add a FcDefaultSubstitute exception

 gtk.supp | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/gtk.supp b/gtk.supp
index ba792113c1..4ae41db76b 100644
--- a/gtk.supp
+++ b/gtk.supp
@@ -149,6 +149,16 @@
    fun:FcFontRenderPrepare
 }
 
+{
+   FcDefaultSubstitute
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:realloc
+   obj:/usr/lib/libfontconfig.so*
+   obj:/usr/lib/libfontconfig.so*
+   fun:FcDefaultSubstitute
+}
+
 # Pango
 {
    pango 1