speeding up buildworld/kernel

[Brian]

I have started using ccache as a result of this thread, the speed 
benefit for old hw is nice.

p3-850 Cele
This would be 3-4 hours for a buildworld and a make kernel, now it is
3234.877u 2318.444s 1:44:56.27 88.1%    2580+1569k 79615+15476io 10553pf+0w

K6-2 450
This would be 8-9 hours for a buildworld and a make kernel, now it is
5835.095u 3103.667s 3:29:42.86 71.0%    -2168+1636k 140556+17495io 
15489pf+0w

This definitely makes it more feasible to use older hardware longer.

Brian