gnu: python-uvloop: Update to 0.16.0.

Version 0.14.0 is not compatible with Python 3.9[1]. Additionally unvendor the
copy of libuv, which was unused, but retained in the source tarball,
fix subprocess spawning and enable tests, so we know when future updates
break it.

[1] https://github.com/MagicStack/uvloop/issues/349

* gnu/packages/python-web.scm (python-uvloop): Update to 0.16.0.
[source]: Add snippet to remove pre-built loop.c and vendored libuv.
[arguments]<#:phases>: Substitute /bin/sh in 'preparations phase, override
'check phase and disable failing tests.
[native-inputs]: Remove python-flake8, because it causes test failures
and add python-pytest-timeout.

gnu: newsboat: Add release-monitoring-url.

* gnu/packages/syndication.scm (newsboat)[properties]: New field.

gnu: youtube-dl: Add release-monitoring-url.

* gnu/packages/video.scm (youtube-dl)[properties]: New field.

gnu: yt-dlp: Add release-monitoring-url.

* gnu/packages/video.scm (yt-dlp)[properties]: New field.

gnu: parallel: Update to 20220122.

* gnu/packages/parallel.scm (parallel): Update to 20220122.

gnu: Add btrbk.

* gnu/packages/backup.scm (btrbk): New variable.

gnu: lagrange: Update to 1.10.2.

* gnu/packages/web-browsers.scm (lagrange): Update to 1.10.2.

gnu: Add grc.

* gnu/packages/shellutils.scm (grc): New variable.

gnu: luajit: Remove powerpc64le-linux from supported-systems.

* gnu/packages/lua.scm (luajit)[supported-systems]: New field.  Set it to the
result of deleting "powerpc64le-linux" from %supported-systems.

gnu: fsearch: Update to 0.1.1.

* gnu/packages/search.scm (fsearch): Update to 0.1.1.

gnu: Add python-tweepy.

* gnu/packages/python-web.scm (python-tweepy): New variable.

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

gnu: zig: Update to 0.9.0

* gnu/packages/patches/zig-disable-libc-note-test.patch: Move patch changes to new file.
* gnu/packages/patches/zig-use-system-paths.patch: Update line numbers.
* gnu/packages/zig.scm: Update to 0.9.0

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

gnu: guile@2.0: Build with '-fexcess-precision=standard' on i686.

Fixes <https://issues.guix.gnu.org/53462>.
Reported by Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>.

This is a followup to 9b09a753a9711f7614564272013138fce6fec708.

* gnu/packages/guile.scm (guile-2.0)[arguments]: Augment #:configure-flags
when 'target-x86-32?'.
(guile-2.2)[arguments]: Tweak #:configure-flags to keep derivation unchanged.
(guile-3.0)[arguments]: Likewise.

gnu: scribus: Update to 1.5.8.

* gnu/packages/scribus.scm (scribus): Update to 1.5.8.
[inputs]: Remove labels.

gnu: emacs-posframe: Update to 1.1.7.

* gnu/packages/emacs-xyz.scm (emacs-posframe): Update to 1.1.7.

gnu: emacs-meow: Update to 1.4.0.

* gnu/packages/emacs-xyz.scm (emacs-meow): Update to 1.4.0.

gnu: emacs-geiser: Update to 0.22.1.

* gnu/packages/emacs-xyz.scm (emacs-geiser): Update to 0.22.1.

gnu: xgboost: Update to 1.5.2.

* gnu/packages/machine-learning.scm (xgboost, python-xgboost): Update to
1.5.2.
(python-xgboost)[arguments]: Enable previously failing test.
* gnu/packages/patches/xgboost-use-system-dmlc-core.patch: Update patch.

Signed-off-by: Ricardo Wurmus <rekado@elephly.net>

etc: Add more SELinux permissions for the daemon.

* etc/guix-daemon.cil.in (guix_daemon): Permit write on guix_daemon_conf_t
sock_file, necessary for garbage collection.

gnu: gcompris-qt: Update to 2.1.

* gnu/packages/education.scm (gcompris-qt): Update to 2.1.
[source]: Download from new upstream location.