gnu: openntpd: Update to 6.2p3.

* gnu/packages/ntp.scm (openntpd): Update to 6.2p3.

gnu: exim: Fix CVE-2017-16943.

* gnu/packages/patches/exim-CVE-2017-16943.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/mail.scm (exim)[source]: Use it.

gnu: image: Rename pngcrunch to pngcrush and update it.

* gnu/packages/image.scm (pngcrush): Renamed from pngcrunch.
[version]: update to 1.8.13.
[arguments]: Use the nolib Makefile.
[origin]: Use the no-lib tar.
[home-page]: update to the new website.
(pngcrunch): New deprecation variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

tests: messaging: Enable Prosody DIGEST-MD5 auth mechanism.

GNU Freetalk doesn't support SCRAM-SHA-1.

* gnu/tests/messaging.scm (%test-prosody): Override default
disable-sasl-mechanisms value.

services: prosody: Add support for disable-sasl-mechanisms.

* doc/guix.texi (Messaging Services): Update accordingly.
* gnu/services/messaging.scm (prosody-configuration)[disable-sasl-mechanisms]:
New field.

services: prosody: Allow to add raw content to the config file.

* doc/guix.texi (Messaging Services): Update accordingly.
* gnu/services/messaging.scm (prosody-configuration)[raw-content]: New field.
(raw-content?, serialize-raw-content): New procedures.

services: prosody: Add support for http-max-content-size.

* doc/guix.texi (Messaging Services): Update accordingly.
* gnu/services/messaging.scm (prosody-configuration)[http-max-content-size]:
New field.

services: prosody: Add support for http-external-url.

* doc/guix.texi (Messaging Services): Update accordingly.
* gnu/services/messaging.scm (prosody-configuration)[http-external-url]: New
field.

services: prosody: Adapt to Prosody 0.10.0.

* doc/guix.texi (Messaging Services): Add "mam" as a module example.  Document
'prosodyctl check'.  Replace 'prosodyctl cert request' with 'prosodyctl cert
import'.  Regenerate it.
* gnu/services/messaging.scm (serialize-module-list): Remove "posix" from the
default modules list because it is now automatically loaded.
(ssl-configuration)[key, certificate]: Remove them because they are now
automatically located.  Fix their docstrings.
(%default-modules-enabled): Add "carbons" and "blocklist".
(prosody-configuration)[certificates]: Set default directory from which
certificates/keys will be automatically located.

gnu: prosody: Add lua5.1-bitop to inputs.

It is required for mod_websocket on Lua 5.1 since Prosody 0.10.

* gnu/packages/messaging.scm (prosody)[inputs]: Add lua5.1-bitop.

gnu: Add lua5.1-bitop.

* gnu/packages/lua.scm (make-lua-bitop): New procedure.
(lua5.2-bitop): Call make-lua-bitop.
(lua5.1-bitop): New variable.

gnu: prosody: Update to 0.10.0.

* gnu/packages/messaging.scm (prosody): Update to 0.10.0.

Signed-off-by: Clément Lassieur <clement@lassieur.org>

vm: Use os-defined initrd intead of base-initrd.

* gnu/system/vm.scm (system-disk-image, system-qemu-image,
  virtualized-operating-system): Replace base-initrd by
  (operating-system-initrd os).

The system produced were always using base-initrd even if the user had
defined a custom initrd based on raw-initrd in the os declaration.

gnu: qtox: Update to 1.13.0.

* gnu/packages/messaging.scm (qtox): Update to 1.13.0.

Signed-off-by: 宋文武 <iyzsong@member.fsf.org>

gnu: tidy-html: Update to 5.6.0.

* gnu/packages/web.scm (tidy-html): Update to 5.6.0.

Signed-off-by: 宋文武 <iyzsong@member.fsf.org>

gnu: mongodb: Remove some bundled sources.

* gnu/packages/databases.scm (mongodb)[source]: Add snippet to remove
some of the bundled sources.
[input]: Remove unused boost input.

gnu: mongodb: Use system wiredtiger when available.

* gnu/packages/databases.scm (mongodb)[inputs]: Add wiredtiger on
64-bit systems.
[arguments]: When using wiredtiger, use system wiredtiger.

gnu: mongodb: Build without wiredtiger on 32-bit systems.

* gnu/packages/databases.scm (mongodb)[arguments]: Add a configure-flag
to build without wiredtiger support on 32-bit systems.

gnu: mongodb: Update to 3.4.10.

* gnu/packages/databases.scm (mongodb): Update to 3.4.10.

gnu: diffoscope: Fix error messages related to comparison tools.

* gnu/packages/package-management.scm (diffoscope)[arguments]: Replace readelf
substitution and add stat and getfacl substitutions.
[inputs]: Add acl.

Errors fixed include the following:
  "FileNotFoundError: [Errno 2] No such file or directory: 'readelf'"
  "diffoscope.comparators.directory: Unable to find 'getfacl', some directory
   metadata differences might not be noticed."
  "diffoscope.comparators.directory: Unable to find 'stat'"