gh-141169: Re-raise exception from findfuncptr

[encukou]

• Issue: Failing to load a module in _PyImport_GetModuleExportHooks can result in a !_PyErr_Occurred(tstate) error #141169

[DinoV]

LGTM! I guess this means if the 1st find failed then the 2nd one will certainly fail too?

[encukou]

Yes.

At least that's the case for CPython's dynamic loading implementations (dynload_hpux.c, dynload_shlib.c, dynload_stub.c, dynload_win.c).
Of course, if someone ports to a different platform, they can add a dynload file (and set DYNLOADFILE in configure) -- and for that case this detail wasn't documented.

I added a comment here, and a TODO item to #140550 to add a note for DYNLOADFILE users to PEP 793 What's New entry.