t6042: add testcase covering rename/rename(2to1)/delete/delete conflict
If either side of a rename/rename(2to1) conflict is itself also involved
in a rename/delete conflict, then the conflict is a little more complex;
we can even have what I'd call a rename/rename(2to1)/delete/delete
conflict. (In some ways, this is similar to a rename/rename(1to2)/add/add
conflict, as added in commit
3672c9714830 ("merge-recursive: Fix working
copy handling for rename/rename/add/add", 2011-08-11)). Add a testcase
for such a conflict.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>