lang/ruby24: Fix build with LibreSSL 2.7

 - LibreSSL 2.7 implements OpenSSL 1.1 API

See also: https://bugs.freebsd.org/226852
Upstream: ruby/openssl#193
Signed-off-by: Bernard Spil <brnrd@FreeBSD.org>

lang/ruby24/files/patch-ext_openssl_extconf.rb

@@ -0,0 +1,15 @@
+--- ext/openssl/extconf.rb.orig 2017-09-08 14:38:12 UTC
++++ ext/openssl/extconf.rb
+@@ -157,8 +157,11 @@ OpenSSL.check_func_or_macro("SSL_get_ser
+ have_func("SSL_is_server")
+ 
+ # added in 1.1.0
++if !have_struct_member("SSL", "ctx", "openssl/ssl.h") ||
++ try_static_assert("LIBRESSL_VERSION_NUMBER >= 0x2070000fL", "openssl/opensslv.h")
++ $defs.push("-DHAVE_OPAQUE_OPENSSL")
++end
+ have_func("CRYPTO_lock") || $defs.push("-DHAVE_OPENSSL_110_THREADING_API")
+-have_struct_member("SSL", "ctx", "openssl/ssl.h") || $defs.push("-DHAVE_OPAQUE_OPENSSL")
+ have_func("BN_GENCB_new")
+ have_func("BN_GENCB_free")
+ have_func("BN_GENCB_get_arg")