[CM] Identify binary plugins

[Elijah Stone]

Afaik, by convention, the file extension for shared libraries is .dylib on 
macos and .dll on windows.

On Wed, 23 Mar 2022, bil at ccrma.Stanford.EDU wrote:

> Thanks, but isn't ELF format specific to Linux?
> My *.so files on a Mac appear to be something else.
> Also, can't an ELF file be an executable?
>
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