Louis Dionne e1aef9e227
[libc++] Fix missing availability check for visionOS in apple_availability.h (#187015)
Without this, we were assuming that __ulock was unavailable on visionOS
and falling back to the manual implementation, when in reality we can
always rely on the existence of ulock.

Fixes #186467
2026-03-19 11:14:12 -04:00
..