Merge branch 'js/mingw-http-ssl'

On platforms with recent cURL library, http.sslBackend configuration variable can be used to choose a different SSL backend at runtime. The Windows port uses this mechanism to switch between OpenSSL and Secure Channel while talking over the HTTPS protocol. * js/mingw-http-ssl: http: when using Secure Channel, ignore sslCAInfo by default http: add support for disabling SSL revocation checks in cURL http: add support for selecting SSL backends at runtime