rpm-sequoia-crypto-policy: Fix build failure on Debian 12+Strongswan

rpm-sequoia-crypto-policy: Fix build failure on Debian 12+Strongswan

rpm-sequoia-crypto-policy tries to validate the configuration files
using host tools. For the Strongswan policy, it uses
"ipsec readwriteconf" which is not available on Debian 12 with
Strongswan installed.
To fix this, add and use an option to skip the problematic validation.

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>