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>
diff --git a/Makefile b/Makefile
index 73d021c..7326e64 100644
--- a/Makefile
+++ b/Makefile
@@ -14,9 +14,6 @@
 .PHONY: all install default clean test
 .PHONY: FORCE cscope
 
-partcheck: all
-	@echo "make partcheck => TODO add tests with out kernel support"
-
 runtests: all
 	@$(MAKE) -C test runtests
 runtests-loop: all