Make System and Utils class based on QObject.

Those classes use Qt objects anyway, and making them based on QObject moved the
strings into the appropriate class when translating.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26931 a1c6a512-1295-4272-9138-f99709370657

rbutil/rbutilqt/base/system.h

@@ -23,12 +23,14 @@
 #ifndef SYSTEM_H
 #define SYSTEM_H
 
+#include <QtCore/QObject>
+
 #include <inttypes.h>
 
 #include <QString>
 #include <QUrl>
 
-class System
+class System : public QObject
 {
 public:
     System() {}