private.syms: Export virDomainNumatuneSpecifiedMaxNode

As of 90286418 the function is introduced. However, it's missing
an entry in the libvirt_private.syms so it can't be mocked.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/libvirt_private.syms

@@ -609,6 +609,7 @@ virDomainNumatuneParseXML;
 virDomainNumatunePlacementTypeFromString;
 virDomainNumatunePlacementTypeToString;
 virDomainNumatuneSet;
+virDomainNumatuneSpecifiedMaxNode;
 
 
 # conf/nwfilter_conf.h