test: add secp224k1 check in crypto-dh-stateless

This commit adds a check to test-crypto-dh-statless to avoid an error if
the curve secp224k1 is not present. This could occur if node was
configured with shared-openssl.

The use case for this was building on RHEL 8.1 which only has the
following curves:
$ openssl ecparam -list_curves
secp224r1 : NIST/SECG curve over a 224 bit prime field
secp256k1 : SECG curve over a 256 bit prime field
secp384r1 : NIST/SECG curve over a 384 bit prime field
secp521r1 : NIST/SECG curve over a 521 bit prime field
prime256v1: X9.62/SECG curve over a 256 bit prime field

test/parallel/test-crypto-dh-stateless.js

@@ -196,9 +196,10 @@ for (const [params1, params2] of [
 test(crypto.generateKeyPairSync('ec', { namedCurve: 'secp256k1' }),
      crypto.generateKeyPairSync('ec', { namedCurve: 'secp256k1' }));
 
+const not256k1 = crypto.getCurves().find((c) => /^sec.*(224|384|512)/.test(c));
 assert.throws(() => {
   test(crypto.generateKeyPairSync('ec', { namedCurve: 'secp256k1' }),
-       crypto.generateKeyPairSync('ec', { namedCurve: 'secp224k1' }));
+       crypto.generateKeyPairSync('ec', { namedCurve: not256k1 }));
 }, {
   name: 'Error',
   code: 'ERR_OSSL_EVP_DIFFERENT_PARAMETERS'