gmp: Support of SHA-3 RSA signatures

testing/hosts/winnetou/etc/strongswan.conf

@@ -0,0 +1,5 @@
+# strongswan.conf - strongSwan configuration file
+
+pki {
+  load = random pem sha1 sha2 sha3 pkcs1 pem gmp mgf1 bliss x509
+}