bug#55634: inkscape does not find icons, needs wrapping or such for GDK_PIXBUF_MODULE_FILE

[Maxime Devos]

Broken:

$ guix shell --pure inkscape -- inkscape

(crashes on start with ‘Inkscape encountered an internal error and will
close now’.)

Work-around:

$ guix shell --pure inkscape gdk-pixbuf -- inkscape

also works:

$ guix shell --pure inkscape gdk-pixbuf -- /usr/bin/env 
GDK_PIXBUF_MODULE_FILE=/gnu/store/[...]-profile/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
 inkscape

Looks like some wrapping is required to point GDK_PIXBUF_MODULE_FILE to an 
appropriate 'loaders.cache'.

Also starts in a non-pure environment without adding extra packages, but then 
the icons aren't found.

Greetings,
Maxime.

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