match_pathname(): drop unused "flags" parameter

This field has not been used since the function was introduced in
b559263216 (exclude: split pathname matching code into a separate
function, 2012-10-15), though there was a brief period where it was
erroneously used and then reverted in ed4958477b (dir: fix pattern
matching on dirs, 2021-09-24) and 5ceb663e92 (dir: fix
directory-matching bug, 2021-11-02).

It's possible we'd eventually add a flag that makes it useful here, but
there are only a handful of callers. It would be easy to add back if
necessary, and in the meantime this makes the function interface less
misleading.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

attr.c

@@ -1023,7 +1023,7 @@ static int path_matches(const char *pathname, int pathlen,
 	}
 	return match_pathname(pathname, pathlen - isdir,
 			      base, baselen,
-			      pattern, prefix, pat->patternlen, pat->flags);
+			      pattern, prefix, pat->patternlen);
 }
 
 static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem);

dir.c

@@ -1244,8 +1244,7 @@ int match_basename(const char *basename, int basenamelen,
 
 int match_pathname(const char *pathname, int pathlen,
 		   const char *base, int baselen,
-		   const char *pattern, int prefix, int patternlen,
-		   unsigned flags)
+		   const char *pattern, int prefix, int patternlen)
 {
 	const char *name;
 	int namelen;
@@ -1347,8 +1346,7 @@ static struct path_pattern *last_matching_pattern_from_list(const char *pathname
 		if (match_pathname(pathname, pathlen,
 				   pattern->base,
 				   pattern->baselen ? pattern->baselen - 1 : 0,
-				   exclude, prefix, pattern->patternlen,
-				   pattern->flags)) {
+				   exclude, prefix, pattern->patternlen)) {
 			res = pattern;
 			break;
 		}

dir.h

@@ -414,7 +414,7 @@ int match_basename(const char *, int,
 		   const char *, int, int, unsigned);
 int match_pathname(const char *, int,
 		   const char *, int,
-		   const char *, int, int, unsigned);
+		   const char *, int, int);
 
 struct path_pattern *last_matching_pattern(struct dir_struct *dir,
 					   struct index_state *istate,