ProjectExplorer: Base IDevice::osType on a data member

Change-Id: I969563e6e62895a51fb4692c8eb0bab278f0ecae
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/qnx/qnxdevice.cpp

@@ -84,17 +84,14 @@ QnxDevice::QnxDevice()
 {
     setDisplayType(tr("QNX"));
     setDefaultDisplayName(tr("QNX Device"));
+    setOsType(OsTypeOtherUnix);
+
     addDeviceAction({tr("Deploy Qt libraries..."), [](const IDevice::Ptr &device, QWidget *parent) {
         QnxDeployQtLibrariesDialog dialog(device, parent);
         dialog.exec();
     }});
 }
 
-OsType QnxDevice::osType() const
-{
-    return OsTypeOtherUnix;
-}
-
 int QnxDevice::qnxVersion() const
 {
     if (m_versionNumber == 0)