Bug#1096487: csound: ftbfs with GCC-15

[Santiago Vila <sanvila@debian.org>]

reopen 1096487
thanks

Hi.

During a rebuild of all packages in unstable, this package failed to
build, and the way it fails:

/build/reproducible-path/csound-6.18.1+dfsg/./include/plugin.h:1005:20: error: ‘struct csnd::InPlug<N>’ has no member named ‘opaddr’; did you mean ‘opadr’? [-Wtemplate-body]

matches the original bug report from Matthias, hence the reopening.

For reference, I'm putting a recent build log here:

https://people.debian.org/~sanvila/build-logs/202509/

Note: The last binNMU was still done using gcc-14.

Thanks.