backport r41808(openssl build issue on fedora)

changeset_r43481.diff

Index: ext/openssl/ossl_pkey_ec.c
===================================================================
--- ext/openssl/ossl_pkey_ec.c
+++ ext/openssl/ossl_pkey_ec.c
@@ -757,8 +757,10 @@
                 method = EC_GFp_mont_method();
             } else if (id == s_GFp_nist) {
                 method = EC_GFp_nist_method();
+#if !defined(OPENSSL_NO_EC2M) 
             } else if (id == s_GF2m_simple) {
                 method = EC_GF2m_simple_method();
+#endif
             }
 
             if (method) {
@@ -811,8 +813,10 @@
 
             if (id == s_GFp) {
                 new_curve = EC_GROUP_new_curve_GFp;
+#if !defined(OPENSSL_NO_EC2M)
             } else if (id == s_GF2m) {
                 new_curve = EC_GROUP_new_curve_GF2m;
+#endif
             } else {
                 rb_raise(rb_eArgError, "unknown symbol, must be :GFp or :GF2m");
             }