FUTEX2 futex_waitv Wired Up For Other Architectures With Linux 5.16-rc3

FUTEX2 as in the new futex_waitv system call landed in Linux 5.16 back during the merge window for improving the efficiency of running Windows games on Linux for those that rely on Windows' WaitForMultipleObjects functionality with futex_waitv is now the ability to wait on multiple futexes. That new system call is now supported on more architectures with the next Linux 5.16 release candidate...