PR modula2/123151: Unable to use IsNoError with Close in FIO library module

PR modula2/123151: Unable to use IsNoError with Close in FIO library module

This is a bug fix to the library module FIO to allow Close to return a
boolean indicating success.  Most probably in the future there should be
a GetStatus procedure provided and the FileStatus enumeration inside
FIO.mod should also be exported.

gcc/m2/ChangeLog:

	PR modula2/123151
	* gm2-libs/FIO.def (IsError): New procedure function.
	(IsActive): Rewrite the comment.
	(Exists): Ditto.
	(OpenToRead): Ditto.
	(OpenToWrite): Ditto.
	(Close): Add an optional BOOLEAN return result.
	* gm2-libs/FIO.mod (Close): Reimplement with an
	optional BOOLEAN return result.

gcc/testsuite/ChangeLog:

	PR modula2/123151
	* gm2/pimlib/base/run/pass/FIO.mod: Reimplement.
	Copy from gm2-libs/FIO.mod since FIO.def api has changed.
	* gm2/pimlib/run/pass/testclose.mod: New test.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>