pack-bitmap: drop unused reuse_objects

This variable is no longer used for doing verbatim pack-reuse (or
anywhere within pack-bitmap.c) since d2ea031 (pack-bitmap: don't rely
on bitmap_git->reuse_objects, 2019-12-18).

Remove it to avoid an unused struct member.

Signed-off-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ttaylorr

pack-bitmap.c

@@ -51,13 +51,6 @@ struct bitmap_index {
 	struct packed_git *pack;
 	struct multi_pack_index *midx;
 
-	/*
-	 * Mark the first `reuse_objects` in the packfile as reused:
-	 * they will be sent as-is without using them for repacking
-	 * calculations
-	 */
-	uint32_t reuse_objects;
-
 	/* mmapped buffer of the whole bitmap index */
 	unsigned char *map;
 	size_t map_size; /* size of the mmaped buffer */