Qnx: Initialize member of qnxqtversion

Change-Id: Icb6b3d7cc513ee1597803658b6a576b4be6ef92a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/qnx/qnxqtversion.h

@@ -81,7 +81,7 @@ private:
     QnxArchitecture m_arch;
     QString m_sdkPath;
 
-    mutable bool m_environmentUpToDate;
+    mutable bool m_environmentUpToDate = false;
     mutable QList<Utils::EnvironmentItem> m_qnxEnv;
 };