xbps-repo(8): added 'show-files' target.

It will search for 'pkgname' and will print its list of files, by
searching it in repository pool. The first repo wins.

Bump XBPS_RELVER to 20091125.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091125021556-n8p6atfbkuvb4doi

bin/xbps-repo/defs.h

@@ -29,6 +29,7 @@
 /* From index.c */
 int	xbps_repo_genindex(const char *);
 /* From util.c */
+int 	show_pkg_files(prop_dictionary_t);
 void    show_pkg_info(prop_dictionary_t);
 int     show_pkg_namedesc(prop_object_t, void *, bool *);
 int     list_strings_in_array(prop_object_t, void *, bool *);