ossl_ssl.c: fix condition

* ext/openssl/ossl_ssl.c (ossl_ssl_alpn_protocol): fix condition
  to compile, needs ALPN to be available.  [Feature #9390]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51392 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Jul 26 19:21:31 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/openssl/ossl_ssl.c (ossl_ssl_alpn_protocol): fix condition
+	  to compile, needs ALPN to be available.  [Feature #9390]
+
 Sun Jul 26 11:29:01 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* signal.c (default_handler, Init_signal): discard SIGSYS, ENOSYS

ext/openssl/ossl_ssl.c

@@ -1932,7 +1932,9 @@ ossl_ssl_npn_protocol(VALUE self)
     else
 	return rb_str_new((const char *) out, outlen);
 }
+# endif
 
+# ifdef HAVE_SSL_CTX_SET_ALPN_SELECT_CB
 /*
  * call-seq:
  *    ssl.alpn_protocol => String