Linux: Update syscall list for 6.16

The generic syscall table has different names for syscalls that take a
timespec64 on 32-bit targets, in that it adds the `_time64` suffix.
Similarly, the `_time32` suffix has been removed.

I'm not sure if the existing logic for determining the proper timespec
struct to use was subtly broken, but it should be a good chance to
finish #4726 - we only have 14 years after all...

As for the changes since 6.11..6.16:

6.11:
 - x86_64 gets `uretprobe`, a syscall to speed up returning BPF probes.
 - Hexagon gets `clone3`, but don't be fooled: it just returns ENOSYS.
6.13:
 - The `*xattr` family of syscalls have been enhanced with new `*xattrat`
   versions, similar to the other file-based `at` calls.
6.15:
 - Atomically create a detached mount tree and set mount options on it.

Author: The-King-of-Toasters