[Maxima] maxima --enable-sbcl + ppc, :purify patch

[Rex Dieter]

Was seeing build failures of recent maxima rc releases on ppc, 
http://bugzilla.redhat.com/238376
One culprit turned out to be maxima's use of :purify t
One of sbcl's developers strongly suggested to not use it since it causes
ppc build to fail and potential performance degradation on other platforms,
like i386, x86_64.

Patch attached.

-- Rex
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