Merge branch 'kn/pack-write-with-reduced-globals'

Code clean-up.

* kn/pack-write-with-reduced-globals:
  pack-write: pass hash_algo to internal functions
  pack-write: pass hash_algo to `write_rev_file()`
  pack-write: pass hash_algo to `write_idx_file()`
  pack-write: pass repository to `index_pack_lockfile()`
  pack-write: pass hash_algo to `fixup_pack_header_footer()`

diff --cc builtin/fast-import.c
Simple merge

diff --cc builtin/index-pack.c
Simple merge

diff --cc builtin/pack-objects.c
Simple merge

diff --cc builtin/receive-pack.c
Simple merge

diff --cc bulk-checkin.c
Simple merge

diff --cc fetch-pack.c
Simple merge

diff --cc midx-write.c
Simple merge

diff --cc pack.h
Simple merge