c++/modules: if translation fails fall back to #include

If a user wrote #include and the .gcm we found won't work, instead of
failing the compile let's do the #include that the source code called for.

This case also prints a note about the failure, like those from
-flang-info-include-translate{,-not} but unconditional.

gcc/cp/ChangeLog:

	* module.cc (module_state::read_config): Add complain parm.
	(module_state::open_slurp): Split out...
	(module_state::do_import): ...from here.
	(module_state::read_initial): Move begin call to open_slurp.
	(module_state::check_importable): New.
	(maybe_translate_include): Call it.

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