Update MacOS Support

[onpon4]

Describe the issue

Naikari's MacOS support, inherited from Naev, is a bit outdated, with only unsigned x86 builds available. It seems that Naev has updated their own MacOS support, but I don't feel up to the task of also updating the support for Naikari, particularly because I don't know much about MacOS and Naikari's codebase and build system has diverged enough from Naev's codebase and build system that I can't just simply cherry-pick those improvements anymore. If anyone more familiar would be up to the task, assisting with this would be a great help, even if it's just porting over the improvements the Naev project has made.