remove memexec.c

[Peter Lobsinger]

We currently have 3 (openbsd, windows, everybody else)
platform-specific implementations of code for allocating,
reallocating, and freeing executable memory pages. This was used at
one time to implement the JIT. I propose we remove this code because:
  (1) it is currently dead code
  (2) candidate libraries for creating a new JIT already provide their
own implementation of this functionality
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