Support Python distributions where _tkinter is compiled in #6006
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In some cases, the Tk library may have been directly compiled in or bundled into the main executable by the time Pillow runs, in which case
__file__
isn't available (nor would it make sense to use, anyway).If
__file__
is missing, then set the library path to None and rely on our Tk loader being able to find the function pointers within the main binary - we know we probably have it because we've managed to import it already.