bug#21227: 24.5; tls connections not verified by default

[Glyph]

In order to have HTTPS connections verified, one must customize the
behavior of tls.el in a highly non-obvious way:

'(tls-checktrust t)
'(tls-program
   (quote
    ("gnutls-cli --x509cafile $A_CERT_BUNDLE -p %p %h")))

leaving the user to determine an appropriate location for
$A_CERT_BUNDLE.

The whole point of TLS is to ensure the authenticity of connections.
Skipping that step is worse than useless - at least if the user *knows*
they're making a plaintext connection they might guess that they don't
have any security.  So Emacs should use a command-line which
authoritatively makes connections correctly, linking against gnutls
itself if necessary.



In GNU Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21)
of 2015-04-10 on builder10-9.porkrind.org
Windowing system distributor `Apple', version 10.3.1348
Configured using:
`configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp''

Important settings:
  locale-coding-system: utf-8-unix

Major mode: Custom

Minor modes in effect:
  ecb-minor-mode: t
  server-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  global-auto-complete-mode: t
  global-quiet-mousewheel-mode: t
  quiet-mousewheel-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  which-function-mode: t
  show-paren-mode: t
  semantic-mode: t
  icomplete-mode: t
  global-auto-revert-mode: t
  electric-pair-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
"Beep."
Quit

Making completion list...

Mark set
"Beep."
Quit
Saving file /Users/glyph/.emacs.d/url/cookies...
Wrote /Users/glyph/.emacs.d/url/cookies

Load-path shadows:
None found.

Features:
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cocoa ns multi-tty emacs)

Memory information:
((conses 16 371323 77866)
(symbols 48 42820 0)
(miscs 40 1349 592)
(strings 32 90979 8531)
(string-bytes 1 2908972)
(vectors 16 36096)
(vector-slots 8 658448 37677)
(floats 8 430 918)
(intervals 56 5019 171)
(buffers 960 41))