Fix build without x509 module
Fix build without x509 module

Fixes: dc85761ef02c ("Add path validation to FFI")
Signed-off-by: Tobias Brunner <059b8b880f8441509ec8a65b50b4c6ae74ebea76@strongswan.org>

webmaster128/botan,randombit/botan,randombit/botan,randombit/botan,webmaster128/botan,randombit/botan,randombit/botan,webmaster128/botan,webmaster128/botan,webmaster128/botan