openssl: Fix for Bug#13117 - adds legacy option in for openssl extraction of cert...

openssl: Fix for Bug#13117 - adds legacy option in for openssl extraction of cert & key

- OpenSSL-3.x gives an error when trying to open insecure .p12 files to extract the cert
   and key for the insecure package download option.
- To make this work the -legacy option is needed in the openssl command, which requires
   the legacy.so library to be available.
- Successfully tested on a vm system.
- Patch set built on Master (CU175 Testing)

Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>