gnu: python2-relatorio: Remove package.

* gnu/packages/python-xyz.scm (python2-relatorio): Delete variable.

gnu: python2-traitlets: Remove package.

* gnu/packages/python-xyz.scm (python2-traitlets): Delete variable.
(python-traitlets)[properties]: Remove.

gnu: python2-colormath: Remove package.

* gnu/packages/python-xyz.scm (python2-colormath): Delete variable.

gnu: python2-spectra: Remove package.

* gnu/packages/python-xyz.scm (python2-spectra): Delete variable.

gnu: shotwell: Build with libsoup 2.

* gnu/packages/gnome.scm (shotwell)[inputs]: Remove libsoup@3. Replace
webkitgtk with webkitgtk-with-libsoup2.

gnu: pitivi: Fix build.

* gnu/packages/video.scm (pitivi)[inputs]: Adjust arguments to
gst-plugins-bad variant.
[arguments]: Use meson-0.59.

gnu: glib-networking: Work around test failure on 32-bit platforms.

On 32-bit platforms with a 32-bit 'time_t', we'd get this test failure:

  GLib-Net:ERROR:../glib-networking-2.70.rc/tls/tests/certificate.c:689:test_certificate_not_valid_after: assertion failed (actual_str == EXPECTED_NOT_VALID_AFTER): ("2037-12-31T23:23:23Z" == "2046-07-25T18:13:10Z")

This commit includes the workaround implemented upstream.

* gnu/packages/patches/glib-networking-32-bit-time.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gnome.scm (glib-networking)[arguments]: New field.

gnu: plotutils: Fix tests on i686.

* gnu/packages/plotutils.scm (plotutils)[arguments]: On 32-bit x86, pass
CFLAGS and add 'skip-sloppy-test' phase.

gnu: python2-cryptography: Remove 'sanity-check phase.

* gnu/packages/python-crypto.scm (python2-cryptography)[arguments]: Do not
inherit; remove 'sanity-check phase.

gnu: cl-slynk: Fix build.

* gnu/packages/lisp-xyz.scm (sbcl-slynk)[arguments]: Fix 'build-image' phase.

gnu: cl-libxml2: Fix build.

Tests are not working properly and the check phase never ends.

* gnu/packages/lisp-xyz.scm (sbcl-cl-libxml2)[arguments]: Disable tests.

gnu: cl-html-encode: Fix source tarball name.

* gnu/packages/lisp-xyz.scp (sbcl-html-encode)[source]: Remove 'file-name'
  field.

gnu: python2-backports-csv: Remove sanity-check phase.

* gnu/packages/python-xyz.scm (python2-backports-csv)[arguments]: Remove
'sanity-check phase.

gnu: python2-astroid: Add missing input and don't inherit.

* gnu/packages/python-xyz.scm (python2-astroid)[arguments]: Do not inherit
from Python 3 package variant.
[propagated-inputs]: Do not inherit and add python2-six.

gnu: asymptote: Fix build.

* gnu/packages/plotutils.scm (asymptote)[native-inputs]: Add
texlive-dvips-l3backend, texlive-fonts-ec, texlive-generic-infwarerr,
texlive-generic-kvdefinekeys, texlive-grfext, texlive-latex-kvoptions,
texlive-latex-pdftexcmds.

gnu: polkit: Define polkit package variable based on architecture.

* gnu/packages/polkit.scm (polkit): Rename to...
(polkit*): ... this.
(polkit-duktape): Adjust to inherit from polkit*.
(polkit-for-system): New procedure.
(polkit): New variable.

gnu: sideload: Update to 6.0.2.

* gnu/packages/pantheon.scm (sideload): Update to 6.0.2.
Delete trailing #t.
[configure-flags]: Remove nonexistent flatpak build option.
[inputs]: Add libhandy.

gnu: gdm: Pass GDK_PIXBUF_MODULE_FILE to sessions.

* gnu/packages/patches/gdm-pass-gdk-pixbuf-loader-env.patch: Add patch.
* gnu/local.mk (dist_patch_DATA): List it.
* gnu/packages/gnome.scm (gdm): Use it.
* gnu/services/xorg.scm (gdm-shepherd-service): Pass GDK_PIXBUF_MODULE_FILE.

Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu: malcontent: Use meson 0.59 to fix build.

* gnu/packages/freedesktop.scm (malcontent)[meson]: Use meson 0.59.

gnu: libostree: Update to 2021.6.

* gnu/packages/package-management.scm (libostree): Update to 2021.6.