t4011: remove SYMLINKS prerequisite
t4011: remove SYMLINKS prerequisite

The part of the test that is about symbolic links in the index does not
require that the corresponding file system entry is actually a symbolic
link. Use test_ln_s_add to insert a symbolic link in the index. When
the file system does not support symbolic links, we actually have a
regular file in the worktree, which  we can update as if it were a
symbolic link. diff-index picks up the symbolic link property from the
index.

Signed-off-by: Johannes Sixt <fd432345609ae4d58c1aa629cb66ba96d1391622@kdbg.org>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git