LibC: Add settimeofday

Author: https://github.com/nico
Commit: 0fff4e11a6
Pull-request: https://github.com/SerenityOS/serenity/pull/3410
Reviewed-by: https://github.com/asynts
Reviewed-by: https://github.com/awesomekling

Libraries/LibC/time.cpp

@@ -55,6 +55,13 @@ int gettimeofday(struct timeval* __restrict__ tv, void* __restrict__)
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
 
+int settimeofday(struct timeval* __restrict__ tv, void* __restrict__)
+{
+    timespec ts;
+    TIMEVAL_TO_TIMESPEC(tv, &ts);
+    return clock_settime(CLOCK_REALTIME, &ts);
+}
+
 char* ctime(const time_t* t)
 {
     return asctime(localtime(t));