[gnumeric] Test: avoid using suppression syntax specific to newer valgrind

[Morten Welinder <mortenw src gnome org>]

commit 4241df97e060a6d4be9cfb52291ffc4116d96478
Author: Morten Welinder <terra gnome org>
Date:   Mon Jan 4 09:52:04 2016 -0500

    Test: avoid using suppression syntax specific to newer valgrind

 test/common.supp |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/test/common.supp b/test/common.supp
index f413ca7..189d1e2 100644
--- a/test/common.supp
+++ b/test/common.supp
@@ -907,7 +907,6 @@
 {
    Leak/gobject_init_ctor
    Memcheck:Leak
-   match-leak-kinds: possible
    ...
    fun:gobject_init_ctor
 }