MakeMaker still a little queasy

Don't release 5.6.2 with MakeMaker 6.20.  There's a few minor problems
relating to the new blibdirs stuff effecting modules that poke around in MM's
guts.  6.21 should fix.

I removed dir_target() in 6.18 but it turns out a handful of modules still 
want to use that, Tk and libwin32 being the important ones, so 6.21 will 
put it back.

Also the new blibdirs thing is being broken by modules that completely
rewrite top_targets().  They really shouldn't be doing that but there's
an awful lot of it going on in CPAN.  SDBM_File and Compress::Zlib being
the most important casualties.  So I'll be moving blibdirs out of
top_targets().  It really shouldn't have been there in the first place.
  

-- 
Michael G Schwern        schwern@pobox.com  http://www.pobox.com/~schwern/
Follow me to certain death!
        http://www.unamerican.com/

• MakeMaker still a little queasy by Michael G Schwern
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