[PATCH] add parallel make support

[Keri Harris]

The attached patch provides parallel make support. This makes quite a 
difference on machines with a reasonable number of processors/cores. For 
example, on a 32-way sparc box the difference is marked; on two fresh 
checkouts of mozart-1.4.0:

$ time make bootstrap
<snip>
real    16m12.348s
user    15m43.094s
sys     0m32.470s

$ time make -j33 bootstrap
<snip>
real    4m10.874s
user    25m47.351s
sys     0m41.507s

Needless to say, the patch doesn't affect a standard make running as a single 
job.
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