encapsulation: add dynamic-extent declaration
Fix proposed by Cliff Brunk: "I use your Common Lisp metering system pretty often on under MCL 2.01. Thanks for making this nice profiling tool available, it has helped alot. However, I notied that the amount of space used by functions that contain an &optional is much higher for the monitoring-encapsulation than from the original function. I beleive this is because the encapsulation creates a list for the optional arguments using &rest. If one adds a dynmaic-extentent declaration after the lambda list in many implementations of Common Lisp the &rest arglist will be stack allocated and the amount of storage reported will be a truer indication of how the function performs outside of the encapsulation. Below is the modification that I'm currently using and seems to work at least under MCL. Cliff Brunk"
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