Ensure that makewhatis is built during bootstrap-tools stage

[arichardson]

Summary

We currently set MK_MAN=no in $BSARGS so MK_MAN_UTILS will also be false
and we always fall back to using makewhatis from $PATH.
I found this because I am currently trying to build without inheriting the
current users $PATH.

Test Plan

makewhatis now exists in $WORLDTMP and installcheck no longer complains if I build without inheriting $PATH

[jhb]

Just adding Bryan to see what he thinks.

[arichardson]

ping?