make clean necessary on windows machines

[Markus Mohrhard]

Hey,

all windows machines that are using an incremental build should use a make
clean once now.

We had some problems with the optimization level and had to revert a
commit. Since we have no dependencies to these commits you need a manual
make clean.

Hopefully this fixes our windows tinderboxes and produces new windows
dailies.

Regards,
Markus
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