sudo: disable SSP for auxiliary build tools mksiglist and mksigname

The do_compile_prepend() fragment ensures that the non-installable build
tools mksiglist and mksigname are built using the BUILD_CC, but if the the
BUILD_CC does not support SSP and the cross compiler does, the build fails
due to the SSP flags set in the Makefile. Ensuring that SSP is not enabled
when building these tools prevents this from happening.

Signed-off-by: Tomas Frydrych <tomas@sleepfive.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
neard: add systemd unit file

Add a systemd unit file, and respect the sysvinit feature when installing the
init script.

(thanks to Jukka Rissanen for the unit file)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>