[gnumeric] tests: suppress another fontconfig leak

[Morten Welinder <mortenw src gnome org>]

commit e2608754cda9b3b7d9ac0f617caf27497f7d4d39
Author: Morten Welinder <terra gnome org>
Date:   Fri Nov 1 14:31:37 2019 -0400

    tests: suppress another fontconfig leak

 test/common.supp | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/test/common.supp b/test/common.supp
index 3e9d4ebb0..1669dc944 100644
--- a/test/common.supp
+++ b/test/common.supp
@@ -868,6 +868,14 @@
    fun:FcConfigValues
 }
 
+{
+   FONTCONFIG/VALUES_LEAK
+   Memcheck:Leak
+   match-leak-kinds: possible
+   fun:calloc
+   fun:FcValueListCreate
+}
+
 # See https://bugs.freedesktop.org/show_bug.cgi?id=87898
 {
    _CAIRO_RECORDING_SURFACE_SNAPSHOT_LEAK