Add alternative CMS P-256 cert

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4134)

test/smime-certs/mksmime-certs.sh

@@ -64,6 +64,10 @@ CN="Test S/MIME EE EC #2" $OPENSSL req -config ca.cnf -nodes \
 	-keyout smec2.pem -out req.pem -newkey ec:ecp2.pem
 $OPENSSL x509 -req -in req.pem -CA smroot.pem -days 3600 \
 	-extfile ca.cnf -extensions usr_cert -CAcreateserial >>smec2.pem
+CN="Test S/MIME EE EC #3" $OPENSSL req -config ca.cnf -nodes \
+	-keyout smec3.pem -out req.pem -newkey ec:ecp.pem
+$OPENSSL x509 -req -in req.pem -CA smroot.pem -days 3600 \
+	-extfile ca.cnf -extensions usr_cert -CAcreateserial >>smec3.pem
 # Create X9.42 DH parameters.
 $OPENSSL genpkey -genparam -algorithm DH -pkeyopt dh_paramgen_type:2 \
 	-out dhp.pem

test/smime-certs/smec3.pem

@@ -0,0 +1,22 @@
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQga03Rl+2K38wgwVyJ
+zSy+knGorGWZBGG5p//ke0WUSbqhRANCAARH8uHBHkuOfuyXgJj7V3lNqUEPiQNo
+xG8ntGjVmKRHfywdUoQJ1PgfbkCEsBk334rRFmja1r+MYyqn/A9ARiGB
+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----