Update to 2.4.10

• Remove MAKE_JOBS_UNSAFE
• Changes: https://github.com/BZFlag-Dev/bzflag/releases

PR: 219317
Reported by: Kevin Zheng (Maintainer) <kevinz5000@gmail.com>
Approved by: miwi (mentor)
Differential Revision: https://reviews.freebsd.org/D10792