Speedup for make clean-depends (and thus make clean)

[Doug Barton]

Alexander Leidinger wrote:

> I could write such a new target, e.g. limited-clean, which could be used
> with update tools if there's some interest in something like this from
> the author of such a tool.

Once again, I appreciate all the effort that's going into thinking 
about this stuff. :)

For portmaster, I use 'make $PM_MAKE_ARGS clean NOCLEANDEPENDS=yes' 
before I start building a port (unless the user specifies -C) and 
after installation is done. Since each portmaster process does that 
for each port, and since portmaster walks the dependency tree itself, 
this works for me, and avoids the painful process of cleaning 
dependencies.

Doug

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