Rework the mechanisms for async GnuTLS connections

* lisp/net/gnutls.el (open-gnutls-stream): Compute the
gnutls-boot parameters and pass them to the process object.
(gnutls-negotiate): New parameter :return-keywords that won't
connect to anything, just compute the keywords.

* lisp/url/url-http.el (url-http): Revert async TLS sentinel
hack, which is no longer necessary.

* src/gnutls.c (Fgnutls_asynchronous_parameters): Rename from
gnutls-mark-process.

* src/process.c (connect_network_socket): If we're connecting to
an asynchronous TLS socket, complete the GnuTLS boot sequence here.

* src/process.h: New parameter gnutls_async_parameters.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/process.h b/src/process.h
index 8bd555b83bd..eb34f5f0411 100644
--- a/src/process.h
+++ b/src/process.h
@@ -191,8 +191,8 @@ struct Lisp_Process
     unsigned int gnutls_extra_peer_verification;
     int gnutls_log_level;
     int gnutls_handshakes_tried;
+    Lisp_Object gnutls_async_parameters;
     bool_bf gnutls_p : 1;
-    bool_bf gnutls_wait_p : 1;
 #endif
 };