* ext/openssl/ossl_pkey_ec.c: Ensure compatibility to builds of
  OpenSSL with OPENSSL_NO_EC2M defined, but OPENSSL_NO_EC not
  defined.
* test/openssl/test_pkey_ec.rb: Iterate over built-in curves
  (and assert their non-emptiness!) instead of hard-coding them, as
  this may cause problems with respect to the different availability
  of individual curves in individual OpenSSL builds.
  [ruby-core:54881] [Bug #8384]

  Thanks to Vit Ondruch for providing the patch!


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41808 b2dd03c8-39d4-4d8f-98ff-823fe69b080e