macOS build fix

[borz7zy]

Linking dependencies were wrapped in a check for Unix, not Apple.
Apple doesn't have the atomic library, so it's not required for linking.

[NexiusTailer]

Can confirm that the current latest commits cannot be built on macOS due to library 'atomic' not found error. Applying your changes solved this.

[xyranaut]

A macOS build is available: https://github.com/Mac-Andreas/omp-launcher-macOS
It requires several tweaks hence it is made as a separate fork of the upstream and will be maintained along side it. Further revisions and roadmap to merge both of streams.

[NexiusTailer]

A macOS build is available: https://github.com/Mac-Andreas/omp-launcher-macOS It requires several tweaks hence it is made as a separate fork of the upstream and will be maintained along side it. Further revisions and roadmap to merge both of streams.

Looks nice, but it is the omp server repo

[xyranaut]

A macOS build is available: https://github.com/Mac-Andreas/omp-launcher-macOS It requires several tweaks hence it is made as a separate fork of the upstream and will be maintained along side it. Further revisions and roadmap to merge both of streams.

Looks nice, but it is the omp server repo

omp server launcher (with Wine layer)
https://github.com/Mac-Andreas/open.mp-Server-Launcher-macOS

Qawno for MacOS:
https://github.com/Mac-Andreas/Qawno-macOS

[NexiusTailer]

But omp server can be built for macos natively, and this PR is literally about that. There's no any point why it's needed to run the server under wine

[AmyrAhmady]

what about dl? is that linkage not required on macos either?