Add tests for other platforms

[ghost]

It would be good to add CI tests for:

• Mac OS X
• BSD
• ARM

[Amanieu]

Keep in mind that on ARM the kernel does not use inter-processor interrupts to perform TLB invalidations on other CPUs. Instead there is a variant of the TLB invalidate instruction which broadcasts to all CPUs. This means that the mprotect trick will not work on ARM (and ARM64).

[ghost]

I didn't realize that, thanks for letting us know!