test: enable to work pkcs12 test in FIPS mode

The pfx file created by pkcs12 command of openssl causes an error in
FIPS mode because its certificate is encrypted with RC2 by default.
Adding `-descert` option resolves the error.

Fix: nodejs#5144
Fix: nodejs#5109

test/fixtures/keys/Makefile

@@ -81,6 +81,7 @@ agent1-cert.pem: agent1-csr.pem ca1-cert.pem ca1-key.pem
 
 agent1-pfx.pem: agent1-cert.pem agent1-key.pem ca1-cert.pem
 	openssl pkcs12 -export \
+		-descert \
 		-in agent1-cert.pem \
 		-inkey agent1-key.pem \
 		-certfile ca1-cert.pem \

test/parallel/test-tls-pfx-gh-5100-regr.js

@@ -7,11 +7,6 @@ if (!common.hasCrypto) {
   return;
 }
 
-if (common.hasFipsCrypto) {
-  console.log('1..0 # Skipped: PFX does not work in FIPS mode');
-  return;
-}
-
 const assert = require('assert');
 const tls = require('tls');
 const fs = require('fs');