gnu: samba: Update to 4.12.7 [security fixes].

Fixes CVE-2020-1472 with 4.12.7.
Fixes CVE-2020-10730, CVE-2020-10745, CVE-2020-10760 and CVE-2020-14303
with 4.12.4.

* gnu/packages/samba.org (samba): Update to 4.12.7.

gnu: metapixel: Fix typo in description.

*  gnu/packages/image-processing.scm (metapixel)[description]: Fix typo.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu: sudo: Update to 1.9.3.

* gnu/packages/admin.scm (sudo): Update to 1.9.3.

gnu: inkscape-1.0: Update to 1.0.1.

* gnu/packages/inkscape.scm (inkscape-1.0): Update to 1.0.1.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu: php: Disable unreliable test.

* gnu/packages/php.scm (php)[arguments]: Delete bug73837.phpt.

services: Docker: Fix typo in configuration.

This is a follow-up to f0a09310e6ff2ed63770cb585c551ba94ce4a9d0.

* gnu/services/docker.scm (docker-shepherd-service): Properly reference
variables in service definition.

gnu: Add texlive-caption.

* gnu/packages/tex.scm (texlive-caption): New variable.

gnu: docker: Compile with seccomp enabled.

* gnu/packages/docker.scm (docker)[arguments]: Adjust custom 'configure
phase to enable seccomp support.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

services: docker: Fix enable-proxy? option.

The userland proxy option does not properly disable the userland proxy when
set to false. Docker defaults to enabling the userland proxy if the option is
unset on the command line.

* gnu/services/docker.scm (docker-shepherd-service): Properly handle the
'enable-proxy?' option.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu: docker: Synchronize docker dependencies with the current version of docker.

* gnu/packages/docker.scm (docker-libnetwork): Update to 19.03-1.026aaba.
[source]: Follow URI redirection.
[arguments]: Adjust import-path accordingly.
[home-page]: Same.
* gnu/packages/networking.scm (go-sctp): Update to 0.0.0-2.6e2cb13.
[arguments]: Skip test suite.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu: texlive-microtype: Tweak description.

* gnu/packages/tex.scm (texlive-microtype)[description]: Fill paragraph
to standard width.

gnu: webkitgtk: Update to 2.30.0.

* gnu/packages/webkit.scm (webkitgtk): Update to 2.30.0.
[arguments]: Add "-DUSE_SYSTEMD=OFF" to the configure flags.

gnu: Rename 'v' to 'vlang'.

* gnu/packages/vlang.scm (v, vlang): Rename 'v' to 'vlang',
keeping 'v' as a deprecated-package.

services: base: Improve container related comments.

* gnu/services/base.scm (guix-shepherd-service): Clarify the usage of a
container for guix-daemon.

build: shepherd: Check for container support.

Fixes: <https://issues.guix.gnu.org/43533>.

* gnu/build/shepherd.scm (fork+exec-command/container): Check if containers
are supported before joining PID namespaces.

gnu: supertuxkart: Sort inputs alphabetically.

* gnu/packages/games.scm (supertuxkart)[inputs]: Sort alphabetically.

gnu: supertuxkart: Update to 1.2.

* gnu/packages/games.scm (supertuxkart): Update to 1.2.
[source]: Update snippet, some of the previously bundled libraries are
gone. Also update URL.
[arguments]: Remove unneeded configure flags.
[inputs]: Add sdl2.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu: eschalot: Cross-compile.

* gnu/packages/crypto.scm (eschalot)[arguments]: Use CC-FOR-TARGET.

gnu: eschalot: Fix build.

* gnu/packages/crypto.scm (eschalot)[inputs]: Use openssl-1.0.

services: dicod: Reduce irony.

* gnu/services/dict.scm (dicod-service): Fix docstring typo.