compel: Move memcpy/memcpy/etc stuff in

This is the difference between two commits

	criu-dev/b0f6f293/Unify own memcpy/memset/memcmp
	  master/0367a1fe/Drop prefix from own memcpy/memset/memcmp

that makes criu-dev after rebase on master with latter commit
be the same as it was with former commit before rebase.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>