Mac build support

[LeftOfHere]

Adds support for mac builds.

To do this I did the following.

• Removed tbb requirement when on mac
• Added ifs for all parallel segments in the code to not use it.
• Added Mac support in unsuck to get system info. This is not accurate at the moment. Someone with more apple and c++ knowledge needs to look at that.

I got the sysinfo from https://github.com/thewtex/tmux-mem-cpu-load.

Tested with 10+GB files and worked.

tested Apple M1 Max and someone else claimed it work on an intel mac.

[SiggyF]

I tested this version and reviewed the code. Looks good to me.

[920364637]

worked for me on my M1 chip mac.

[fahu]

I can confirm that it works on macOS (v14.4.1), M1.