QmlDesigner: cleanup code

Change-Id: Ibebef6313113ff0097586373795e6117b7112876
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

share/qtcreator/qml/qmlpuppet/container/sharedmemory_unix.cpp

@@ -49,16 +49,10 @@
 
 #include <private/qcore_unix_p.h>
 
-#ifdef Q_OS_OSX
-#define NAME_MAX PSHMNAMLEN
-#endif
-
-#ifndef QStringLiteral
-#define QStringLiteral(str) QString::fromUtf8(str)
+#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+#define QStringLiteral(str) QLatin1String(str)
 #endif
 
-#include <QRegExp>
-
 namespace QmlDesigner {
 
 class SharedMemoryLocker