Linux: change timerfd wrapper names used for arguments

Linux: change timerfd wrapper names used for arguments

The  now match the manpage names:

SYNOPSIS
       #include <sys/timerfd.h>

       int timerfd_create(int clockid, int flags);

       int timerfd_settime(int fd, int flags,
                           const struct itimerspec *new_value,
                           struct itimerspec *old_value);
       int timerfd_gettime(int fd, struct itimerspec *curr_value);