BSD fixes

I just committed change 31968 to ExtUtils::MM_Unix to add dragonfly to
the list of BSD-like OSes. See
http://public.activestate.com/cgi-bin/perlbrowse/p/31968

But while doing so, I noticed that the statement was buggy anyway, so I
fixed that too:
http://public.activestate.com/cgi-bin/perlbrowse/p/31969

Smokes are running...

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