[Ecls-list] ffi broken in windows

[Dustin Long]

There is a problem with how ffi currently loads libraries in windows. Each call to def-function loads a new instance of a dll, which breaks any libraries that rely on shared state. The fix is to only copy and reload libraries if they've changed since they were last loaded. A patch is attached, and here is a link to a simple example demonstrating the problem:
http://personal.stevens.edu/~dlong/load-time-test-case.zip

Dustin

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