parse-options: drop unused parse_opt_ctx_t member

5c38742 (parse-options: don't emit "ambiguous option" for aliases,
2019-04-29) added "updated_options" to struct parse_opt_ctx_t, but it
has never been used.  Remove it.

Signed-off-by: René Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

parse-options.h

@@ -459,7 +459,6 @@ struct parse_opt_ctx_t {
 	unsigned has_subcommands;
 	const char *prefix;
 	const char **alias_groups; /* must be in groups of 3 elements! */
-	struct option *updated_options;
 };
 
 void parse_options_start(struct parse_opt_ctx_t *ctx,