gnu: go-1.17: Build with gcc:lib on arm* architectures.

* gnu/packages/golang.scm (go-1.17)[arguments]: Add phase on arm*
architectures to link to gcc:lib.
[inputs]: When building for arm* don't remove gcc:lib.

gnu: go-1.17: Simplify native-inputs.

* gnu/packages/golang.scm (go-1.17)[native-inputs]: Remove unnecessary
quoting.

tests: rsync: Define several modules.

* gnu/tests/rsync.scm (run-rsync-test)["Test file not copied to
read-only share", "Test file correctly received from read-only share"]:
New tests.
(%rsync-os): Define two modules.

services: rsync: Allow configuring several rsync "modules".

Until now the rsync service would export a single module, named
"files".  This allows users to specify as many modules as they want, in
line with rsyncd.conf(5).

* gnu/services/rsync.scm (warn-share-field-deprecation): New procedure.
(<rsync-configuration>)[modules]: New field.
[share-path, share-comment, read-only?, timeout]: Mark as deprecated.
(<rsync-module>): New record type.
(%default-modules): New variable.
(rsync-configuration-modules): New procedure.
(rsync-activation): Create the directory of each module.
(rsync-config-file): Generate configuration for each module.
(rsync-service-type)[description]: New field.
* doc/guix.texi (Networking Services): Adjust documentation.  Augment
example.

gnu: binutils-gold: Skip gold testsuite on some architectures.

* gnu/packages/base.scm (binutils-gold)[arguments]: Add a phase on some
architecturest to skip the gold testsuite.

gnu: Add vim-gnupg.

* gnu/packages/vim.scm (vim-gnupg): New variable.

gnu: python-statsmodels: Remove cythonized files from tarball.

* gnu/packages/statistics.scm (python-statsmodels)[source]: Add snippet
to remove cythonized files.

Revert "gnu: python-pingouin: Update to 0.5.0."

This reverts commit f2ad33bc3933b710e5beb6592a9a4925b91b199a.

python-pingouin after 0.3.12 needs newer versions of all the python
science libraries.

gnu: guix-build-coordinator: Update to 0-41.6b6218d.

* gnu/packages/package-management.scm (guix-build-coordinator): Update to
0-41.6b6218d.

gnu: Add nar-herder.

* gnu/packages/package-management.scm (nar-herder): New variable.

gnu: opencv: Fix installation.

This is a follow-up to commit 5894b1210d689ec408db21184b85b0a6a1a5ca3e.

* gnu/packages/image-processing.scm (opencv)[arguments]: Add build phase
'do-not-install-3rdparty-file.

gnu: emacs-geiser: Update to 0.20.1.

* gnu/packages/emacs-xyz.scm (emacs-geiser): Update to 0.20.1.

gnu: Add fsearch.

* gnu/packages/search.scm (fsearch): New variable.

gnu: tuir: Skip sanity-check.

* gnu/packages/syndication.scm (tuir)[arguments]: Remove 'sanity-check.

gnu: qutebrowser: Remove unnecessary input.

* gnu/packages/web-browsers.scm (qutebrowser)[inputs]: Remove
python-importlib-resources.

gnu: WebKitGTK: Update to 2.34.3 [fixes CVE-2021-{30809,30887,30890}].

* gnu/packages/webkit.scm (webkitgtk): Update to 2.34.3.

gnu: parlatype: Update to 3.1.

* gnu/packages/gnome.scm (parlatype): Update to 3.1.
[native-inputs]: Remove labels.

gnu: axel: Update to 2.17.11.

* gnu/packages/networking.scm (axel): Update to 2.17.11.

gnu: emacs-geiser-guile: Update to 0.20.

* gnu/packages/emacs-xyz.scm (emacs-geiser-guile): Update to 0.20.

gnu: emacs-geiser: Update to 0.20.

* gnu/packages/emacs-xyz.scm (emacs-geiser): Update to 0.20.
[propagated-inputs]: Add emacs-transient.