Remove QBasicAtomic::tryLock with a timer

The non-futex implementation does not support timed locks in
QBasicMutex. That is only supported in QMutex (due to the
destructor).

Change-Id: I46d33a66a36e05c8a4344823537178e80a6ddd76
Reviewed-by: Qt Doc Bot <qt_docbot@qt-project.org>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/corelib/thread/qmutex.h

@@ -75,8 +75,8 @@ public:
             unlockInternal();
     }
 
-    bool tryLock(int timeout = 0) QT_MUTEX_LOCK_NOEXCEPT {
-        return fastTryLock() || lockInternal(timeout);
+    bool tryLock() Q_DECL_NOTHROW {
+        return fastTryLock();
     }
 
     bool isRecursive();