rbutilqt: Add missing 'Q_OBJECT' macros to three classes

Change-Id: I0999c286facc06039a456243f6f0525f939e97d6

utils/rbutilqt/base/playerbuildinfo.h

@@ -30,6 +30,7 @@
 // For build info data retrieved from the build server has to be passed.
 class PlayerBuildInfo : public QObject
 {
+    Q_OBJECT
 public:
 
     enum BuildType {

utils/rbutilqt/base/system.h

@@ -32,6 +32,7 @@
 
 class System : public QObject
 {
+    Q_OBJECT
 public:
     System() {}
 
@@ -50,4 +51,3 @@ public:
 
 };
 #endif
-

utils/rbutilqt/base/utils.h

@@ -29,6 +29,7 @@
 
 class Utils : public QObject
 {
+    Q_OBJECT
 public:
     enum Size {
         FilesystemTotal,
@@ -61,4 +62,3 @@ public:
 };
 
 #endif
-