ipmitool: disable FreeIPMI support

ipmitool: disable FreeIPMI support

Now that we are building FreeIPMI library ipmitool will detect it
and since we are already passing --enable-intf-free it will build
support for FreeIPMI as well.

However, --enable-intf-free was previously no-op since it would just
fail to detect FreeIPMI and disable support for it but now it seems
that buildbots build FreeIPMI first and then ipmitool will fail with
missing dependency on FreeIPMI library.

Since FreeIPMI is quite big and previously ipmitool was built without
support for it anyway lets disable support for FreeIPMI in ipmitool and
if its required it can be made optional or as a package variant later.

This fixes building ipmitool via buildbots again.

Signed-off-by: Robert Marko <redacted>