gnu: geeqie: Fix X11 error at startup.

Fixes <https://issues.guix.gnu.org/52089>.
Reported by Maxim Cournoyer <maxim.cournoyer@gmail.com>.
Patch provided by John Kehayias <john.kehayias@protonmail.com>.

* gnu/packages/patches/geeqie-clutter.patch: New file.
* gnu/packages/image-viewers.scm (geeqie)[sources]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu: mumps: Allow compilation with GCC 10.

Following the suggestion at
<https://community.freefem.org/t/compline-on-macos-10-15-6/543>.

* gnu/packages/maths.scm (mumps)[arguments]: In 'configure' phase, add
'-fallow-argument-mismatch' to 'OPTF'.

services: %desktop-services: Use SDDM rather than GDM on non-x86_64.

This works around the fact that Rust is currently unavailable in Guix on
platforms other than x86_64-linux:

  https://lists.gnu.org/archive/html/guix-devel/2021-11/msg00197.html

* gnu/services/desktop.scm (desktop-services-for-system): New
procedure.
(%desktop-services): Turn into a macro.

system: Mark 'services' field as thunked.

This allows us to make services dependent on (%current-system), for
example.

* gnu/system.scm (<operating-system>)[services]: Mark as thunked.

gnu: idutils: Fix build with glibc 2.33.

* gnu/packages/idutils.scm (idutils)[source]: Remove reference to 'gets'
from "lib/stdio.in.h".

gnu: libtorrent-rasterbar: Build with default cmake.

* gnu/packages/bittorrent.scm (libtorrent-rasterbar)[arguments]: Remove
cmake flag.

gnu: tadbit: Update to 1.0.1-1.5c4c1dd.

* gnu/packages/bioinformatics.scm (tadbit): Update to 1.0.1-1.5c4c1dd.
[arguments]: Remove trailing #T from build phases; pass -fcommon to test
binaries; run tests conditionally.

gnu: python2-sphinx: Remove websupport test.

* gnu/packages/sphinx.scm (python2-sphinx)[arguments]: Remove websupport test
file.

gnu: python2-sphinxcontrib-websupport: Downgrade to 1.1.2.

* gnu/packages/sphinx.scm (python2-sphinxcontrib-websupport): Downgrade to
1.1.2.
[arguments]: Override; delete 'sanity-check phase.
[propagated-inputs]: Override and add python2-six.
(python-sphinxcontrib-websupport)[properties]: Record python2-variant.

gnu: python2-jinja2: Downgrade to 2.11.3

* gnu/packages/python-xyz.scm (python2-jinja2): Downgrade to the last version
supporting Python 2.
(python-jinja2)[properties]: Record python2-variant.

gnu: python2-markupsafe: Downgrade to 1.1.1.

* gnu/packages/python-xyz.scm (python2-markupsafe): Downgrade to 1.1.1,
because that's the last version to support Python 2.

gnu: ocaml-mcl: Add -fcommon to compiler flags.

* gnu/packages/machine-learning.scm (ocaml-mcl)[arguments]: Add -fcommon.

gnu: paml: Pass -fcommon to compiler.

* gnu/packages/bioinformatics.scm (paml)[arguments]: Set CFLAGS.

gnu: paml: Remove trailing #T.

* gnu/packages/bioinformatics.scm (paml)[arguments]: Remove trailing #T from
build phases.

gnu: sambamba: Remove trailing #T.

* gnu/packages/bioinformatics.scm (sambamba)[arguments]: Remove trailing #T
from build phases.

gnu: discrover: Add texlive-fonts-ec to inputs.

* gnu/packages/bioinformatics.scm (discrover)[native-inputs]: Add
texlive-fonts-ec.

gnu: discrover: Remove trailing #T.

* gnu/packages/bioinformatics.scm (discrover)[arguments]: Remove trailing #T
from build phases.

gnu: tbsp: Update to 1.0.0-2.dc30c03.

* gnu/packages/bioinformatics.scm (tbsp): Update to 1.0.0-2.dc30c03.
[arguments]: Relax requirement on matplot.  This may turn out to be a mistake.
[inputs]: Replace python-biopython with python-biopython-1.73.

gnu: mantis: Update to 0.1-2.b6979a2.

* gnu/packages/bioinformatics.scm (mantis): Update to 0.1-2.b6979a2.
[arguments]: Disable the use of SSE4.2 instructions.
[native-inputs]: Build with GCC 7.

gnu: imp: Disable tests.

* gnu/packages/bioinformatics.scm (imp)[arguments]: Disable unreliable test
suite.