build: disable `-Wnon-virtual-dtor` compiler warning

It's overkill and suffers from annoying false positives that
prevent us from applying the "protected non-virtual destructor"
idiom in several perfectly valid cases. See for instance the
GCC bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102168

The -Wdelete-non-virtual-dtor warning (included in -Wall) is
the preferred alternative and is enough to catch the unsafe
cases without false positives.

Partially reverts 847de408cbb2358bbb664d971cc33e73b0b2ef7f

Change-Id: I46ee1f01e7d4e2b125c2c534c6550824ba1de4c0
diff --git a/tests/daemon/fw/topology-tester.cpp b/tests/daemon/fw/topology-tester.cpp
index a758ee2..a7ff33a 100644
--- a/tests/daemon/fw/topology-tester.cpp
+++ b/tests/daemon/fw/topology-tester.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  Regents of the University of California,
+ * Copyright (c) 2014-2023,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -125,7 +125,7 @@
   m_clientTransport->connectToForwarder(m_forwarderTransport);
 }
 
-class TopologyBareLink::Observer : public face::InternalTransportBase
+class TopologyBareLink::Observer final : public face::InternalTransportBase
 {
 public:
   explicit