[plt-scheme] mzscheme resident size

I noticed that while building DrScheme from source,
mzscheme in v360 grows to a very large size (over 256M
in resident size).  This difference between v352 and v360
was immediately noticeable on my FreeBSD 4 machine (which
has 256M of RAM) :).

If this change of behaviour was unintentional, please treat
this message as a "heads-up".

-- 
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