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Rather than checking for the main thread, check for the current
thread.

* emacs-module.c (check_thread): New function.
(MODULE_FUNCTION_BEGIN_NO_CATCH, module_get_environment)
(module_non_local_exit_check, module_non_local_exit_clear)
(module_non_local_exit_get, module_non_local_exit_signal)
(module_non_local_exit_throw, module_is_not_nil, module_eq): Use it.