Merge branch 'rs/dedup-includes'

Code cleanup.

* rs/dedup-includes:
  treewide: remove duplicate #include directives

diff --cc builtin/am.c
Simple merge

diff --cc builtin/blame.c
Simple merge

diff --cc builtin/clone.c
Simple merge

diff --cc builtin/rev-list.c
Simple merge

diff --cc builtin/worktree.c
Simple merge

diff --cc packfile.c
Simple merge

diff --cc shallow.c
Simple merge