[Backport to v9.18] Fix named failing to start on Solaris systems with hundreds of CPUs
This commit fixes a startup issue on Solaris systems with many (reportedly > 510) CPUs by bumping RLIMIT_NOFILE. This appears to be a regression from 9.11.
Backport of !6955 (merged)
Closes #3563 (closed)
Edited by Michał Kępień