There's a merged pull request on the void-packages repository

firebird3: add patches to fix ppc64 builds and respect c(xx)flags
https://github.com/void-linux/void-packages/pull/12904
Description: These are from Fedora. If I don't apply these, build fails on `ppc64le` with

```
make[3]: Entering directory '/builddir/Firebird-3.0.4.33054-0/gen'
rm -f metadata.fdb
/builddir/Firebird-3.0.4.33054-0/gen/Release/firebird/bin/isql -q -i /builddir/Firebird-3.0.4.33054-0/src/dbs/metadata.sql
rm -f msg.fdb
double free or corruption (out)
```

@pullmoll