added a detailed error description if ptrace is not permitted

Change-Id: I555fddcabdd2311e55907073c15d5627d3283a73
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/gdb/gdbengine.h

@@ -167,6 +167,7 @@ public:
     QString toString(bool debug = false) const;
 
     static QString msgDumperOutdated(double requiredVersion, double currentVersion);
+    static QString msgPtraceErr(DebuggerStartMode sm);
 
 private:
     typedef QMap<QByteArray, Type> NameTypeMap;