ssl_client_cert does not work with gnutls

[LeSpocky]

I compiled mutt with GnuTLS since it's GPL. Parameter ssl_client_cert is not recognized there (it is if I compile against OpenSSL). This makes it impossible to use SMTP over TLS because the client cert is required there. The mailserver responses with

2007-06-15 00:12:44 TLS error on connection from localhost 
(poldy.lespocky.dyndns.org) [127.0.0.1] (SSL_accept): 
error:140890C7:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:peer 
did not return a certificate

if I don't set a client cert.

[brendan]

I had a look at adding gnutls support for client certificates, but I didn't see anything in the API providing passphrase callbacks to decrypt the certificate key.

[brendan]

(In [fe615fd5e0de]) Basic support for $ssl_client_cert when compiled with gnutls. The key must not be encrypted. Closes #2911.