Meson: Use QVersionNumber instead of self-made substitute

Change-Id: I6d4168a0be3e14f39baf469f47bc292779fe286a
Reviewed-by: hjk <hjk@qt.io>

src/plugins/mesonprojectmanager/mesoninfo.h

@@ -3,14 +3,14 @@
 
 #pragma once
 
-#include "versionhelper.h"
+#include <QVersionNumber>
 
 namespace MesonProjectManager {
 namespace Internal {
 
 struct MesonInfo
 {
-    Version mesonVersion;
+    QVersionNumber mesonVersion;
 };
 
 } // namespace Internal