completion: use __gitcomp_builtin in _git_clean

The new completable options are --exclude and --interactive

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/clean.c

@@ -909,7 +909,7 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT__QUIET(&quiet, N_("do not print names of files removed")),
 		OPT__DRY_RUN(&dry_run, N_("dry run")),
-		OPT__FORCE(&force, N_("force"), 0),
+		OPT__FORCE(&force, N_("force"), PARSE_OPT_NOCOMPLETE),
 		OPT_BOOL('i', "interactive", &interactive, N_("interactive cleaning")),
 		OPT_BOOL('d', NULL, &remove_directories,
 				N_("remove whole directories")),

contrib/completion/git-completion.bash

@@ -1307,7 +1307,7 @@ _git_clean ()
 {
 	case "$cur" in
 	--*)
-		__gitcomp "--dry-run --quiet"
+		__gitcomp_builtin clean
 		return
 		;;
 	esac