merge-ort: have process_entries operate in a defined order

We want to handle paths below a directory before needing to handle the
directory itself.  Also, we want to handle the directory immediately
after the paths below it, so we can't use simple lexicographic ordering
from strcmp (which would insert foo.txt between foo and foo/file.c).
Copy string_list_df_name_compare() from merge-recursive.c, and set up a
string list of paths sorted by that function so that we can iterate in
the desired order.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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