procs/weaks/hashtab: Removed a bit of useless mark/free code.
* libguile/hashtab.c (UNMARKED_CELL_P): Removed.
(scm_i_scan_weak_hashtables): Removed.
* libguile/hashtab.h (scm_i_scan_weak_hashtables): Removed.
* libguile/procs.c (scm_mark_subr_table): Removed.
* libguile/procs.h (scm_mark_subr_table): Removed.
* libguile/weaks.c (UNMARKED_CELL_P): Removed.
(scm_i_remove_weaks): Removed.
(scm_i_remove_weaks_from_weak_vectors): Removed.
git-archimport-id: lcourtes@laas.fr--2005-libre/guile-core--boehm-gc--1.9--patch-18