extensions/desktop: preload bindtextdomain from snap first if it exists

[mmtrt]

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This fixes error caused by desktop-launch loading amd64 bindtextdomain.so first from gnome-platform then i386 from snap.

ERROR: ld.so: object '/snap/test/x1/gnome-platform/$LIB/bindtextdomain.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

[codecov-commenter]

Codecov Report

Merging #3738 (1ad71aa) into main (9a1bf8f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3738   +/-   ##
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  Coverage   86.52%   86.52%           
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  Files          58       58           
  Lines        3207     3207           
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  Hits         2775     2775           
  Misses        432      432           

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[Thermionix]

I'm attempting to solve wine segfaulting on my fusion360 snap and am still receiving the following after updating snapcraft to the edge channel.

ERROR: ld.so: object '/snap/fusion360/x1/gnome-platform/$LIB/bindtextdomain.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

$ snapcraft -V
snapcraft 7.0.7.post8+git727f3920
$ snap run --shell fusion360
$ ls $SNAP/gnome-platform/lib/x86_64-linux-gnu/
bindtextdomain.so

[mmtrt]

@Thermionix see fixes and try. https://github.com/mmtrt/sumatrapdf-snap/blob/8cdcd4f35d3991c0892f9a884955e3b9339a0cb4/snap/snapcraft.yaml#L89