SSL: guard use of all SSL options for bug workarounds. Some of the OpenSSL forks (read: BoringSSL) started removing unused, no longer necessary and/or not really working bug workarounds along with the SSL options and defines for them. Instead of fixing nginx build after each removal, be proactive and guard use of all SSL options for bug workarounds. Signed-off-by: Piotr Sikora <piotr@cloudflare.com>