Makefile: Remove the `partcheck` target

Remove the `partcheck` target because it has remained unused for nearly
four years, and the associated TODO comment has not been actioned since
its introduction in commit:

  b57dbc2d308a849 ("configure/Makefile: introduce libdevdir defaults to $(libdir)")

Cc: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Link: https://lore.kernel.org/r/20231219115423.222134-2-ammarfaizi2@gnuweeb.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed