bug#55968: Grafts don't support non-ASCII file name.

[Maxime Devos]

Build a package whose store items contain non-ASCII file names and uses grafts:

$ guix build tectonic
[...]
De volgende transplantaat zal worden gemaakt:
   /gnu/store/p48cj1v9mk7g4hj4dcyv1azawcw6sk25-tectonic-0.8.2.drv
3 transplantaten aanbrengen voor tectonic-0.8.2 ...
grafting '/gnu/store/57rmskg2iybx4dzar8w868msxnc3z4b5-tectonic-0.8.2' -> 
'/gnu/store/ybsgj73xxvin7cjnxabdawiadi08gd2v-tectonic-0.8.2'...
find-files: 
/gnu/store/57rmskg2iybx4dzar8w868msxnc3z4b5-tectonic-0.8.2/share/cargo/src/tectonic-0.8.2/tests/tex-outputs/hall??chen
 ???? welt ????.xdv: No such file or directory
find-files: 
/gnu/store/57rmskg2iybx4dzar8w868msxnc3z4b5-tectonic-0.8.2/share/cargo/src/tectonic-0.8.2/tests/tex-outputs/hall??chen
 ???? welt ????.tex: No such file or directory
find-files: 
/gnu/store/57rmskg2iybx4dzar8w868msxnc3z4b5-tectonic-0.8.2/share/cargo/src/tectonic-0.8.2/tests/tex-outputs/hall??chen
 ???? welt ????.log: No such file or directory
/gnu/store/p48cj1v9mk7g4hj4dcyv1azawcw6sk25-tectonic-0.8.2.drv succesvol gebouwd
/gnu/store/ybsgj73xxvin7cjnxabdawiadi08gd2v-tectonic-0.8.2

The grafted version does not contain the file name starting with 'hall':

$ ls 
/gnu/store/57rmskg2iybx4dzar8w868msxnc3z4b5-tectonic-0.8.2/share/cargo/src/tectonic-0.8.2/tests/tex-outputs/
[ file is missing! ]

Now compare this with the original, non-grafted store item:

$ stat $(guix build --no-grafts 
tectonic)/share/cargo/src/tectonic-0.8.2/tests/tex-outputs/hallöchen\ 🐨\ welt\ 
🌍.xdv
[ it exists! ]

A similar fix as in <https://issues.guix.gnu.org/54893> may be needed.

Greetings,
Maxime.

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