[issue47162] Add call trampoline to work around bad fpcasts on Emscripten

[Hood Chatham]

Hood Chatham <roberthoodchatham at gmail.com> added the comment:

Actually, I think the _PyImport_InitFunc trampoline call is only there as a work around for the problematic `test_imp` and `test_import` Python tests. I don't know of any third party code with a problem there.

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<https://bugs.python.org/issue47162>
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