gh-99948: Support ctypes.util.find_library in emscripten environment (#138519)

Adds support for ctypes loading .so files directly.

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Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Russell Keith-Magee <russell@keith-magee.com>