openssl: fix test failure on Fedora 23

* test/openssl/test_pair.rb (test_ecdh_curves): Avoid P-224. The FIPS
  patch from RHEL disables it. The curve has to be chosen from: {
  secp256k1, secp384r1, secp521r1, prime256v1 }.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55224 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/openssl/test_pair.rb

@@ -425,7 +425,7 @@ module OpenSSL::TestPairM
 
     ctx1 = OpenSSL::SSL::SSLContext.new
     ctx1.ciphers = "ECDH"
-    ctx1.ecdh_curves = "P-384:P-224"
+    ctx1.ecdh_curves = "P-384:P-521"
     s1 = OpenSSL::SSL::SSLSocket.new(sock1, ctx1)
 
     ctx2 = OpenSSL::SSL::SSLContext.new