[Chicken-hackers] Make ##sys#with-print-length-limit threadsafe

[Jim Ursetto]

Core hackers:

Under heavy load, spiffy will begin printing error messages such
as "...: ...: 25" and then header and body output is typically
corrupted in short order.  This is due to the
##sys#with-print-length-limit call in http:error-hook.  The patch
fixes the issue by making ##sys#with-print-length-limit
threadsafe.

parameterize-print-length.txt
Description: Text document