gh-117657: Fix data races for set_inheritable in fileutils.c with free-threaded builds

[aisk]

ioctl_works in set_inheritable function is a static variable which has three possible values:

Value	Meaning
-1	Initial value when the process starts.
0	ioctl cannot be used for this functionality; fcntl is used as a fallback.
1	ioctl works in the current environment, and we should continue to use it.

When it is 0, using ioctl as a fast path will always be skipped.

When it is -1 or 1, ioctl will be used as a fast path to perform the functionality, and it will be set to 0 or 1 based on the result of whether ioctl raises an error or not. And if ioctl failed, use fnctl as a slow path fallback.

Following this logic, it is safe to call set_inheritable with multiple threads in a free-threaded build. The fast path can be safely used even if it leads to failure. Therefore, we can simply use atomic operations to read or write ioctl_works's value to resolve data races.

• Issue: Make TSAN tests pass with the GIL disabled in free-threaded builds #117657

[aisk]

Sorry, just noticed that this is duplicated with #120175.