upgrade to RPC::XML 0.50

perl-xml/perl-xml.spec

@@ -45,7 +45,7 @@
 %define       V_html_tagset          3.03
 %define       V_html_parser          3.27
 %define       V_html_tree            3.17
-%define       V_rpc_xml              0.46
+%define       V_rpc_xml              0.50
 %define       V_soap_lite            0.55
 %define       V_soap_lite_smartproxy 0.11
 %define       V_soap_payload         1.02