diff_filespec: drop xfrm_flags field

The only mention of this field in the code is by some
debugging code which prints it out (and it will always be
zero, since we never touch it otherwise). It was obsoleted
very early on by 25d5ea4 ([PATCH] Redo rename/copy detection
logic., 2005-05-24).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/diff.c b/diff.c
index e34bf97..7749653 100644
--- a/diff.c
+++ b/diff.c
@@ -4120,9 +4120,9 @@
 		DIFF_FILE_VALID(s) ? "valid" : "invalid",
 		s->mode,
 		s->sha1_valid ? sha1_to_hex(s->sha1) : "");
-	fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
+	fprintf(stderr, "queue[%d] %s size %lu\n",
 		x, one ? one : "",
-		s->size, s->xfrm_flags);
+		s->size);
 }
 
 void diff_debug_filepair(const struct diff_filepair *p, int i)