Bug#1096681: gbsplay: ftbfs with GCC-15

[Christian Garbs <mitch@cgarbs.de>]

This should be fixed by this upstream commit:
https://github.com/mmitch/gbsplay/commit/118ed43ae47c6db6b6aec57a4ecdafff8cb86abd

The fix is based on the error message, we did not set up an
experimental Debian environment.

version overview:

- currently Debian unstable contains gbsplay 0.0.97
- gbsplay 0.0.98 was released just 2 days ago
  and is not yet packaged for Debian
- the fix will be part of gbsplay 0.0.99,
  which has no release date set yet

Regards
Christian