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Previously signals, throws, and quits from module initialization
functions were ignored.  These function aren't special, and better
errors can be reported using signals than with the initialization
return code, so allow non-local exits.

* src/emacs-module.c (module_signal_or_throw): New helper function.
(Fmodule_load, funcall_module): Use it.
(Fmodule_load): Also allow quitting.