[gtk] suppression file: Add glReadPixels mesa exception

[Timm Bäder <baedert src gnome org>]

commit b8549a142ea5240b5253afff09c8e908efaf6492
Author: Timm Bäder <mail baedert org>
Date:   Sat Jul 13 09:38:14 2019 +0200

    suppression file: Add glReadPixels mesa exception

 gtk.supp | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/gtk.supp b/gtk.supp
index 73921a4b57..ba792113c1 100644
--- a/gtk.supp
+++ b/gtk.supp
@@ -117,6 +117,17 @@
    obj:/usr/lib/dri/i965_dri.so*
 }
 
+{
+   mesa glReadPixels
+   Memcheck:Addr16
+   obj:*
+   obj:*
+   obj:*
+   obj:*
+   obj:*
+   fun:epoxy_glReadPixels_global_rewrite_ptr
+}
+
 # Fontconfig
 {
    FcFontSetList