[PATCH 2/2] add a flag to disable using of Perls MakeMaker module.

There installations (Cygwin + ActivateState Perl) where the generated makefiles
are not usable, because of lineendings and backslashes. The flags is
NO_PERL_MAKEMAKER.

Signed-off-by: Alex Riesen <redacted>

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Just remembered configure script. Maybe it could be taught to
notice the situation and do something about it (like setting the NO_MAKEMAKER).