Support hash v8 databases from BDB < 4.6 in bdb_ro

In Hash v8 databases page type differs from newer ones to denote
the difference between sorted and unsorted pages.

Fixes reading rpm databases from older distros like SLES 11 and RHEL 5
(RhBug:1965147)

lib/backend/bdb_ro.c

@@ -276,7 +276,7 @@ static int hash_lookup(struct bdb_cur *cur, const unsigned char *key, unsigned i
     pg = hash_bucket_to_page(cur->db, bucket);
     if (bdb_getpage(cur->db, cur->page, pg))
 	return -1;
-    if (cur->page[25] != 8 && cur->page[25] != 13)
+    if (cur->page[25] != 8 && cur->page[25] != 13 && cur->page[25] != 2)
 	return -1;
     cur->idx = (unsigned int)-2;
     cur->numidx = *(uint16_t *)(cur->page + 20);
@@ -323,7 +323,7 @@ static int hash_next(struct bdb_cur *cur)
 	    }
 	    if (bdb_getpage(cur->db, cur->page, pg))
 		return -1;
-	    if (cur->page[25] != 8 && cur->page[25] != 13)
+	    if (cur->page[25] != 8 && cur->page[25] != 13 && cur->page[25] != 2)
 		return -1;
 	    cur->numidx = *(uint16_t *)(cur->page + 20);
 	    continue;