Remove the last usage of deprecated Carbon APIs from Qt Creator

Change-Id: I05c8345e5f1618e7ecbb8a9c27feb5b9a321dc11
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Vikas Pachdha <vikas.pachdha@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/processhandle.cpp

@@ -68,4 +68,11 @@ bool ProcessHandle::equals(const ProcessHandle &rhs) const
     return m_pid == rhs.m_pid;
 }
 
+#ifndef Q_OS_MACOS
+bool ProcessHandle::activate()
+{
+    return false;
+}
+#endif
+
 } // Utils