bug#56223: h-client not running with a host distribution

[Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>]

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Hi,

After having done a 'guix pull', I added h-client to a system image made
with guix system image, and when running that image I could launch
h-client with any of the following command lines:
$ h-client
$ sudo -E h-client

However with Parabola i686 (also after having done a 'guix pull',
h-client doesn't work anymore, and it gives the following error:
> Traceback (most recent call last):
>   File "/gnu/store/vbw6w6527y2xmxnyb4v4s9hp5ydk7i1d-h-client-0.0a0-1.e6c78b1/bin/.h-client-real", line 33, in <module>
>     sys.exit(load_entry_point('hclient==0.0a0.dev0', 'console_scripts', 'h-client')())
>   File "/gnu/store/vbw6w6527y2xmxnyb4v4s9hp5ydk7i1d-h-client-0.0a0-1.e6c78b1/bin/.h-client-real", line 25, in importlib_load_entry_point
>     return next(matches).load()
>   File "/gnu/store/x5qnvlqgcb73nksrzavpq8pg9xgrfwqv-python-3.9.9/lib/python3.9/importlib/metadata.py", line 77, in load
>     module = import_module(match.group('module'))
>   File "/gnu/store/x5qnvlqgcb73nksrzavpq8pg9xgrfwqv-python-3.9.9/lib/python3.9/importlib/__init__.py", line 127, in import_module
>     return _bootstrap._gcd_import(name[level:], package, level)
>   File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
>   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
>   File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
>   File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
>   File "<frozen importlib._bootstrap_external>", line 850, in exec_module
>   File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
>   File "/gnu/store/vbw6w6527y2xmxnyb4v4s9hp5ydk7i1d-h-client-0.0a0-1.e6c78b1/lib/python3.9/site-packages/hclient/gtkclient.py", line 20, in <module>
>     gi.require_version('GdkPixbuf', '2.0')
>   File "/gnu/store/8yca9x2l0k0m5726m2hs2mpdma14h5yr-python-pygobject-3.40.1/lib/python3.9/site-packages/gi/__init__.py", line 126, in require_version
>     raise ValueError('Namespace %s not available' % namespace)
> ValueError: Namespace GdkPixbuf not available

I vaguely remember that I could launch it on top of Parabola before, so
it seems to be related to recent updates to the h-client packages
(through before sending data didn't always work due to a bug in the
server that is now fixed).

PS: I've added Maxim in To as pers is the last person who worked on
    improving the h-client package, so maybe pers has more knowledge
    than me on that.

Denis.

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