Failed to build simulator

I tried to build simulator on my M2 MBA, It produce error like below.
```
➞ ./tools/configure.sh -m sim:nsh
No configuration change.
➞ make clean
➞ make -j8
Create version.h
CC: misc/lib_fnmatch.c sched/sched_cpuload.c:109:25: error: use of undeclared identifier 'CONFIG_SCHED_CPULOAD_TIMECONSTANT'
if (g_cpuload_total > CPULOAD_TIMECONSTANT)
^
sched/sched_cpuload.c:59:7: note: expanded from macro 'CPULOAD_TIMECONSTANT'
CONFIG_SCHED_CPULOAD_TIMECONSTANT * \
^
1 error generated.
make[1]: *** [sched_cpuload.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [sched/libsched.a] Error 2
make: *** Waiting for unfinished jobs....
```
I fetched master branch before I build.

Reproduce the failure with ./tools/configure.sh -m sim:nsh, make clean, and make -j8. Start with sched/sched_cpuload.c and the reported CONFIG_SCHED_CPULOAD_TIMECONSTANT error, then trace how the simulator configuration is generated. Done means the simulator build completes without this undeclared-identifier error.

Written by the indexing model from the issue text.