gnu: Replace all uses of atk by at-spi2-core.

* gnu/packages/animation.scm (gnash)
* gnu/packages/chromium.scm (ungoogled-chromium)
* gnu/packages/crates-gtk.scm (rust-atk-sys-0.14,
rust-atk-sys-0.10, rust-atk-0.14, rust-gtk-0.14)
* gnu/packages/gimp.scm (gimp)
* gnu/packages/gnome.scm (evince, glade3, clutter, totem, rhythmbox, mutter, ghex):
* gnu/packages/graphviz.scm (xdot)
* gnu/packages/gtk.scm (gtk+-2, gtk+, guile-gnome, atkmm)
* gnu/packages/mate.scm (mate-applets, atril, mate-control-center, mate-calc,
mate-utils, eom, pluma)
* gnu/packages/messaging.scm (dino)
* gnu/packages/qt.scm (qtwebengine-5)
* gnu/packages/rust-apps.scm (alfis)
* gnu/packages/vim.scm (vim-full)
* gnu/packages/vnc.scm (remmina)
* gnu/packages/web.scm (castor): Replace atk by at-spi2-core.

Signed-off-by: Guillaume Le Vaillant <glv@posteo.net>

gnu: python-pytest-isort: Update to 3.1.0.

Resolves test failures.

* gnu/packages/python-check.scm (python-pytest-isort)[arguments]: Remove #:phases,
disable tests.
[native-inputs]: Remove python-mock.

gnu: ucommon: Explicitly select C++ version.

* gnu/packages/telephony.scm (ucommon)[arguments]: Set -std=c++14.

gnu: ghc-language-c: Update to 0.9.1.

This fixes issues with GCC 11, see
https://github.com/haskell/c2hs/issues/268.

* gnu/packages/haskell-xyz.scm (ghc-language-c): Update to 0.9.1.

gnu: python-fixtures: Add missing dependency.

* gnu/packages/check.scm (python-fixtures)[propagated-inputs]: Add
python-extras.

gnu: python-fixtures-bootstrap: Add missing dependency.

* gnu/packages/check.scm (python-fixtures-bootstrap)[propagated-inputs]:
Add python-extras.

gnu: python-testtools: Remove unused dependency.

* gnu/packages/check.scm (python-testtools)[propagated-inputs]: Remove
python-extras.

gnu: python-testtools-bootstrap: Update to 2.6.0.

Supports Python 3.10 and 3.11.

* gnu/packages/check.scm (python-testtools-bootstrap): Update to 2.6.0.
[propagated-inputs]: Remove python-extras, which is not a dependency.

gnu: guile: Skip OOM test on powerpc64le-linux.

* gnu/packages/guile/scm (guile-3.0)[arguments]: Add phase when building
for powerpc64le-linux disabling the OOM test.

gnu: libgc: Fix building on powerpc-linux.

* gnu/pakcages/bdw-gc.scm (libgc)[arguments]: When building for
powerpc-linux add a make-flag to not protect virtual-dirty bits.

gnu: libgc: Fix building on powerpc64le-linux.

* gnu/packages/bdw-gc.scm (libgc)[arguments]: Add a make-flag when
building for powerpc64le-linux to disable using SDB (soft-dirty bits).

gnu: python-trio: Run pytest on tests directory only.

Failing to do so causes cryptic module load errors.

* gnu/packages/python-xyz.scm (python-trio)[arguments]: Add path parameter
to invoke.

maint: Re-add IceCat to '%system-packages'.

Suggested by Andreas Enge <andreas@enge.fr>.

* etc/release-manifest.scm (%system-packages): Uncomment "icecat" since
'%system-manifest' already filters it out where needed.

gnu: guile: Fix 'posix_spawn' usage for GNU/Hurd.

* gnu/packages/guile.scm (guile-3.0)[arguments]: Add
'patch-posix-spawn-usage' phase.
* gnu/packages/patches/guile-hurd-posix-spawn.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu: guile-readline: Switch to gexps.

* gnu/packages/guile.scm (make-guile-readline): Switch to gexps.

gnu: guile: Switch to gexps.

* gnu/packages/guile.scm (guile-3.0)[arguments]: Switch to gexps.
(guile-next)[arguments]: Likewise.

gnu: guile-static: Switch to gexps.

* gnu/packages/make-bootstrap.scm (make-guile-static): Switch to gexps.

gnu: linux-pam: Allow compilation on GNU/Hurd.

* gnu/packages/linux.scm (linux-pam)[arguments]: Add #:phases.

gnu: linux-pam: Switch to gexps.

* gnu/packages/linux.scm (linux-pam)[arguments]: Switch to gexps.

system: hurd: Use shepherd-0.8 in the package list.

* gnu/system/hurd.scm (%base-packages/hurd): Change shepherd to shepherd-0.8,
since the former uses fibers, and thus conflicts with the shepherd-0.8 we use in
the default essential services.

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