QSystemSemaphore: make it a Q_GADGET

So we can have Q_ENUM.

Change-Id: If4c23ea3719947d790d4fffd17152a37d0fe551b
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/corelib/kernel/qsystemsemaphore.cpp

@@ -326,3 +326,5 @@ QString QSystemSemaphore::errorString() const
 #endif // QT_CONFIG(systemsemaphore)
 
 QT_END_NAMESPACE
+
+#include "moc_qsystemsemaphore.cpp"

src/corelib/kernel/qsystemsemaphore.h

@@ -17,6 +17,7 @@ class QSystemSemaphorePrivate;
 
 class Q_CORE_EXPORT QSystemSemaphore
 {
+    Q_GADGET
     Q_DECLARE_TR_FUNCTIONS(QSystemSemaphore)
 public:
     enum AccessMode
@@ -24,6 +25,7 @@ public:
         Open,
         Create
     };
+    Q_ENUM(AccessMode)
 
     enum SystemSemaphoreError
     {