GitLab

* gnutls.c (gnutls_hex_string, gnutls_certificate_details)
(Fgnutls_peer_status): New functions to export TLS certificate
details to Emacs Lisp.

* process.h: Added more fields to Lisp_Process to track
certificate details.

* gnutls.c (Fgnutls_boot): Save certificate for later inspection.