core:sys/linux - implement clock_settime, clock_getres and clock_nanosleep

[yeongjukang]

Hi, I implemented clock_settime, clock_getres and clock_nanosleep.
Below codeblock is my test for the procedures and seem to work.
cc. @flysand7

package main

import "core:fmt"
import "core:sys/linux"

main :: proc() {
    realtime := linux.Clock_Id.REALTIME
    r1, e1 := linux.clock_gettime(realtime)
    fmt.println("clock_gettime result:", r1)
    fmt.println("e1:", e1)

    r2 := &r1
    e2 := linux.clock_settime(realtime, r2)
    fmt.println("clock_settime result:", r2)
    fmt.println("e2:", e2)

    fmt.println("clock_nanosleep - Sleeping for 1s 5ns")
    req := linux.Time_Spec{ uint(1), uint(5)}
    rem := linux.Time_Spec{}
    e3 := linux.clock_nanosleep(realtime, { linux.ITimer_Flags_Bits.ABSTIME } , &req, &rem)
    fmt.println("e3:", e3)
    
    r4, e4 := linux.clock_getres(realtime)
    fmt.println("clock_getres result:", r4)
    fmt.println("e4:", e4)
}

[yeongjukang]

Thank you for the review @laytan.
I Updated it.