runtime: use futexes with 64-bit time on Linux
Linux introduced new syscalls to fix the year 2038 issue.
To still be able to use the old ones, the Kconfig option
COMPAT_32BIT_TIME would be necessary.
Use the new syscall with 64-bit values for futex by default.
Define _ENOSYS for detecting if it's not available.
Add a fallback to use the older syscall in case the new one is
not available, since Go runs on Linux from 2.6.32 on, per
https://go.dev/wiki/MinimumRequirements.
Updates #75133
Change-Id: I65daff0a3d06b55440ff05d8f5a9aa1c07eb201d
GitHub-Last-Rev:
96dd1bd84bd12d898e971157fc83da562cc4f6b4
GitHub-Pull-Request: golang/go#75306
Reviewed-on: https://go-review.googlesource.com/c/go/+/701615
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>