Merge branch 'tb/midx-avoid-cruft-packs'

"pack-objects" has been taught to avoid pointing into objects in cruft packs from midx. * tb/midx-avoid-cruft-packs: repack: exclude cruft pack(s) from the MIDX where possible pack-objects: introduce '--stdin-packs=follow' pack-objects: swap 'show_{object,commit}_pack_hint' pack-objects: fix typo in 'show_object_pack_hint()' pack-objects: perform name-hash traversal for unpacked objects pack-objects: declare 'rev_info' for '--stdin-packs' earlier pack-objects: factor out handling '--stdin-packs' pack-objects: limit scope in 'add_object_entry_from_pack()' pack-objects: use standard option incompatibility functions