upgrade to Graphviz 1.7.7

graphviz/graphviz.spec

@@ -31,11 +31,11 @@ Packager:     The OpenPKG Project
 Distribution: OpenPKG [EXP]
 Group:        Graphics
 License:      GPL
-Version:      1.7.6
+Version:      1.7.7
 Release:      %{l_branch}.0
 
 #   list of sources
-Source0:      http://www.research.att.com/sw/tools/graphviz/dist/graphviz-%{version}.tar.gz
+Source0:      http://www.research.att.com/sw/tools/graphviz/dist/graphviz-%{version}.tgz
 
 #   build information
 Prefix:       %{l_prefix}