Function webkit2gtk_sys::webkit_web_context_allow_tls_certificate_for_host

pub unsafe extern "C" fn webkit_web_context_allow_tls_certificate_for_host(
    context: *mut WebKitWebContext, 
    certificate: *mut GTlsCertificate, 
    host: *const c_char
)

This is supported on crate feature v2_6 only.