Makefile: ASCII-sort += lists

Makefile: ASCII-sort += lists

There are many += lists in the Makefile and, over time, they have gotten
slightly out of ASCII order. Sort all += lists to bring them back in
order.

ASCII sorting was chosen over strict alphabetical order even though, if
we omit file prefixes, the lists aren't sorted in strictly alphabetical
order (e.g. archive.o comes after archive-zip.o instead of before
archive-tar.o). This is intentional because the purpose of maintaining
the sorted list is to ensure line insertions are deterministic. By using
ASCII ordering, it is more easily mechanically reproducible in the
future, such as by using :sort in Vim.

This patch is best viewed with `--color-moved`.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>