merge revision(s) 41808,41829: [Backport #8384] [Backport #9065]

	* 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!

	* test/openssl/test_pkey_ec.rb: Skip tests for "Oakley" curves as
	  they are not suitable for ECDSA.
	  [ruby-core:54881] [Bug #8384]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@43481 b2dd03c8-39d4-4d8f-98ff-823fe69b080e