Perf trampoline fails to build on macOS < 10.12

[jmroot]

Bug report

Bug description:

The code uses clock_gettime which was added in macOS 10.12, and also MAP_ANONYMOUS which is sometimes spelled MAP_ANON. I was initially going to suggest just disabling this feature on the older systems, but actually fixing it for all x86 Macs turned out to be fairly simple, so I'll be opening a PR that does that shortly.

CPython versions tested on:

3.15

Operating systems tested on:

macOS

Linked PRs

• gh-140421: Fix perf trampoline on older macOS #140422

[hugovk]

macOS 10.11 El Capitan is pretty old, it was EOL in 2018.

macOS 10.12 Sierra was released in 2016, and the Python macOS installer supports 10.15 Catalina and later:

https://docs.python.org/3/using/mac.html#using-python-for-macos-from-python-org

But I'll let the JIT maintainers decide about this change.