lib/53125: sys/timevar.h is absent in installed systems.

[utkarsh009%yandex.com@localhost]

>Number:         53125
>Category:       lib
>Synopsis:       sys/timevar.h is absent in installed systems.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 24 10:30:00 +0000 2018
>Originator:     Utkarsh Anand
>Release:        NetBSD 8.0_BETA
>Organization:
>Environment:
NetBSD  8.0_BETA NetBSD 8.0_BETA (GENERIC) #1: Mon Mar 12 19:41:15 IST 2018  root@Microknoppix:/extra/netbsd-8/sys/arch/amd64/compile/GENERIC amd64
>Description:
I was compiling a file on NetBSD where I needed to #define _KERNEL, but it requires sys/timevar.h to be present, but it isn't present anywhere on installed systems. Although, it is present in src/sys/sys.
>How-To-Repeat:
Try compiling a C file with the following content:
#define _KERNEL
#include <sys/time.h>
int main(){
    return 0;
}
>Fix: