net/mpich: Update to 4.2.1
- Submitter becomes maintainer
- Remove bash dependency
- Restore the www doc folder
- Remove bugfix for slurm_query_node_list.c as it was fixed upstream
While I'm here:
- Remove GNU_CONFIGURE_MANPREFIX after 9fd7ee1cdf6c
ChangeLog: https://www.mpich.org/2024/04/17/mpich-4-2-1-released/
PR: 278505