Macos apple silicon

[bjoernh]

Adjusted the MacOS Makefile for building Gearbox on Intel and also Apple Silicon (M1/M2..) Macs.

[bjoernh]

Github Actions don't support builds on macOS Arm64 yet, but it's on there Roadmap for this Summer
github/roadmap#528

With a self hosted Apple Silicon GitHub runner it is nowadays possible to build for apple silicon.
https://github.blog/changelog/2022-08-09-github-actions-self-hosted-runners-now-support-apple-m1-hardware/

I had give it a shoot on my local machine and the app builds with GitHub actions in the forked repo:
https://github.com/bjoernh/Gearboy/actions/runs/4217099134/jobs/7320636708

[drhelius]

Thanks for your help.
You can omit the macOS Arm64 build for now. Let's wait for the official one.
In the meantime we can keep the Intel one only.
Please, revert changes to GH Actions YML and I will happily merge it.

[bjoernh]

Committing the changes on the GH Actions YML File to the MR was not intended. 😅 So I removed it from the MR

[drhelius]

Thanks!