Fix binpkg installation with multiple repositories.

New changes include a modified algorithm of the previous one, which
finally does not fail even with multiple repos, YAY!

Fixed some leaks as well, thanks to valgrind.

--HG--
extra : convert_revision : 3cffe1e9e9e9f7abf225ca3c6643377fc12a94bd

include/plist.h

@@ -44,9 +44,12 @@ bool xbps_add_obj_to_array(prop_array_t, prop_object_t);
  */
 int
 xbps_callback_array_iter_in_dict(prop_dictionary_t, const char *,
-				 int (*func)(prop_object_t, void *, bool *),
+				 int (*fn)(prop_object_t, void *, bool *),
 				 void *);
-
+int
+xbps_callback_array_iter_in_repolist(const char *,
+				     int (*fn)(prop_object_t, void *, bool *),
+				     void *);
 /*
  * Finds a package's dictionary into the main dictionary.
  *