Update libgc?

[Ken Brown]

Hi Andy,

I'm getting a crash in cyggc-1.dll when building asymptote.  Any chance you 
could update libgc to a later release?  I built and installed libgc-8.0.2, which 
is the latest release available at http://www.hboehm.info/gc/gc_source/, and the 
crash didn't occur.

Thanks.

Ken
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