Add non-exec stack annotation only for ELF

[giordano]

No description provided.

[eparshut]

@giordano, Thanks for your contribution!
Your change makes sense for MacOS, however we are disabling PT support for MacOS since we have x86-specific assembly instructions. Do you need PT support for MacOS? Could you provide any details?

[giordano]

I come from the Julia community and we still have some (admittedly not many at this point) still on Intel MacBook and would be nice to support them if possible. It's also good to know if this package doesn't support a certain platform anymore, but I think the REAMDE still suggests macOS (and Windows, too, also relevant for this PR) is supported.

[eparshut]

I come from the Julia community and we still have some (admittedly not many at this point) still on Intel MacBook and would be nice to support them if possible. It's also good to know if this package doesn't support a certain platform anymore, but I think the REAMDE still suggests macOS (and Windows, too, also relevant for this PR) is supported.

Yes, that's right, we still claim macOS support, but not full functionality (except Intel PT).
The assembly sources from this PR are related to Intel PT support, and it can only be enabled in the library using a special build option (-pt). At the same time, for Windows we use different assembly sources.
Anyway, thanks again for your PR, it may help macOS users, I'll be happy to merge it!