:conf should run in $BDIR

I find myself running :conf like this

    :chdir $BDIR
    :conf header {required} boost/spirit.hpp {language = C++}
    :chdir -

because the compilation process will sometimes leave files
behind, such as conftest.rpo in case of C++, and I don't
want them to clutter up the main source. IMHO, :conf should
do this automatically, since these tests really are platform
dependent anyway.

Peter



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