[gtk] gtk.supp: Add a pixman_image_composite32 exception

[Timm Bäder <baedert src gnome org>]

commit f6d7967e96a3b674459d996e24052d32e99b80ad
Author: Timm Bäder <mail baedert org>
Date:   Sun Jul 21 09:13:24 2019 +0200

    gtk.supp: Add a pixman_image_composite32 exception

 gtk.supp | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/gtk.supp b/gtk.supp
index 4ae41db76b..bda9308dd7 100644
--- a/gtk.supp
+++ b/gtk.supp
@@ -159,6 +159,15 @@
    fun:FcDefaultSubstitute
 }
 
+# Pixman
+{
+   pixman_image_composite32
+   Memcheck:Cond
+   obj:/usr/lib/libpixman-1.so*
+   obj:/usr/lib/libpixman-1.so*
+   fun:pixman_image_composite32
+}
+
 # Pango
 {
    pango 1