spport/check-bin-arch: accept arbitrary per-package ignore paths

spport/check-bin-arch: accept arbitrary per-package ignore paths

Some packages (mostly, out-of-tree) may want to install binary blobs for
another architecture,  outside the locations we currently exclude, like
in /opt or whatever...

Add support in check-bin-arch to accept any arbitrary location, that
individual package can each request to excude from the check, when they
are installed.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>