test/Makefile: rm bad code

The 'umount2: umount2' doesn't make sense as it's a circular dependency.
It came from commit e7b152fd and probably meant to say
"umount2: umount2.c" instead.

But it's not needed either as make has implicit rules like that.

Drop the "zdtm_ct: zdtm_ct.c" for same reason.

travis-ci: success for test/Makefile: rm bad code
Cc: Andrei Vagin <avagin@openvz.org>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/Makefile

@@ -19,10 +19,6 @@ other:
 	done
 .PHONY: other
 
-zdtm_ct: zdtm_ct.c
-
-umount2: umount2
-
 zdtm:
 	./zdtm.py run -a --parallel 2
 .PHONY: zdtm