tools: enable endian checks for all sparse builds

commit 376a5fb34b04524af501a0c5979c5920be940e05 upstream.

We dropped need for __CHECK_ENDIAN__ for linux,
this mirrors this for tools.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>