[geary/wip/ubuntu-1804-network-unreachable] Fix "Peer sent fatal TLS alert: Decode error" on Ubuntu 18.04

[Michael Gratton <mjog src gnome org>]

commit 3914593360aa2a134f913bf088cae9dda0bfec7b
Author: Michael Gratton <mike vee net>
Date:   Wed Feb 20 10:35:37 2019 +1100

    Fix "Peer sent fatal TLS alert: Decode error" on Ubuntu 18.04
    
    Setting an explicit TLS server identity seems to be broken on the
    version of GLib shipped by Ubutnu 18.04, so disable for now.

 src/engine/api/geary-endpoint.vala | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/src/engine/api/geary-endpoint.vala b/src/engine/api/geary-endpoint.vala
index c7fbc444..c833c92d 100644
--- a/src/engine/api/geary-endpoint.vala
+++ b/src/engine/api/geary-endpoint.vala
@@ -190,7 +190,9 @@ public class Geary.Endpoint : BaseObject {
     }
 
     private void prepare_tls_cx(GLib.TlsClientConnection tls_cx) {
-        tls_cx.server_identity = this.remote;
+        // Setting this on Ubuntu 18.04 breaks some TLS
+        // connections. See issue #217.
+        // tls_cx.server_identity = this.remote;
         tls_cx.validation_flags = this.tls_validation_flags;
         if (Endpoint.default_tls_database != null) {
             tls_cx.set_database(Endpoint.default_tls_database);