`make dist` fails due to missing bzip header

```
checking for bzlib.h... no
real_configure: error: could not find bzlib.h - the header of libbz2 library. Cf. https://doc.sagemath.org/html/en/reference/spkg/_prereq.html
```
https://github.com/sagemath/sage/actions/runs/15888768081/job/44806968371#step:4:98