QmlJS checks: Disable warnings about expression statements in bindings.

Change-Id: Ic3aca50bec93ec3b810dbda2f9b57eefb966bbdf
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/qmljs/qmljscheck.h

@@ -148,6 +148,7 @@ private:
     QHash< int, QList<MessageTypeAndSuppression> > m_disabledMessageTypesByLine;
 
     bool _importsOk;
+    bool _inStatementBinding;
 };
 
 } // namespace QmlJS