[BusyBox] [RFC] build system change: support building in separate directory

[egor duda]

egor duda wrote:
> Ok, here's an updated patch.
> 'make check' should work now, and one make creates Makefile in build 
> directory, so one can run 'make' in build directory after that.

ahem. It looks like i'm slightly late with it but... Here's a little 
addition to make 'make O=/some/where PREFIX=/some/where/else install' 
work. Sorry for delay :(

egor
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