net-mgmt/flowd: compiler issue on 11.2 too

PR: https://forum.opnsense.org/index.php?topic=11237.0

net-mgmt/flowd/Makefile

@@ -47,7 +47,7 @@ post-build-PERL-on:
 		${MAKE_CMD})
 
 post-build-PYTHON-on:
-	( cd ${WRKSRC} && CFLAGS="-O2 -pipe" ${PYTHON_CMD} setup.py build )
+	( cd ${WRKSRC} && CFLAGS="-O0 -pipe" ${PYTHON_CMD} setup.py build )
 
 pre-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}