Don't hardcode shared lib versions.

Index: src/gtk/gnome/gvfs.cpp
--- src/gtk/gnome/gvfs.cpp.orig
+++ src/gtk/gnome/gvfs.cpp
@@ -63,7 +63,7 @@ wxGnomeVFSLibrary::wxGnomeVFSLibrary()
 {
     wxLogNull log;
 
-    m_libGnomeVFS.Load("libgnomevfs-2.so.0");
+    m_libGnomeVFS.Load("libgnomevfs-2.so");
     m_ok = m_libGnomeVFS.IsLoaded() && InitializeMethods();
 }