Merge branch 'rs/packfile-bad-object-list-in-oidset'

Replace a handcrafted data structure used to keep track of bad objects in the packfile API by an oidset. * rs/packfile-bad-object-list-in-oidset: packfile: use oidset for bad objects packfile: convert has_packed_and_bad() to object_id packfile: convert mark_bad_packed_object() to object_id midx: inline nth_midxed_pack_entry() oidset: make oidset_size() an inline function