Added yet another Qt4 suppression pattern.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8503 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/glibc-2.X-drd.supp b/glibc-2.X-drd.supp
index fd60c3b..f04544a 100644
--- a/glibc-2.X-drd.supp
+++ b/glibc-2.X-drd.supp
@@ -415,3 +415,14 @@
    fun:_ZN7QObjectD2Ev
    fun:_ZN20QEventDispatcherGlibD0Ev
 }
+{
+   libQtCore-QObjectPrivate::clearGuards(QObject*)
+   drd:ConflictingAccess
+   fun:_ZN14QReadWriteLock12lockForWriteEv
+   fun:_ZN12QWriteLocker6relockEv
+   fun:_ZN12QWriteLockerC1EP14QReadWriteLock
+   fun:_ZN14QObjectPrivate11clearGuardsEP7QObject
+   fun:_ZN7QObjectD2Ev
+   fun:_ZN24QAbstractEventDispatcherD2Ev
+   fun:_ZN20QEventDispatcherGlibD0Ev
+}