[PATCH] PR modula2/117555: libgm2 build failure after r15-5081-g95960cd473297c

[PATCH] PR modula2/117555: libgm2 build failure after r15-5081-g95960cd473297c

This patch adds missing return statements to library procedure
functions.  These missing statements occur after a call to RAISE.

gcc/m2/ChangeLog:

	PR modula2/117555
	* gm2-libs-iso/M2EXCEPTION.mod (M2Exception): Add missing
	return statement.
	* gm2-libs-iso/RealConv.mod (ValueReal): Ditto.
	* gm2-libs-iso/RndFile.mod (StartPos): Ditto.
	(EndPos): Ditto.
	(NewPos): Ditto.
	* gm2-libs-iso/ShortConv.mod (ValueReal): Ditto.
	* gm2-libs-iso/WholeConv.mod (ValueInt): Ditto.
	(ValueCard): Ditto.

(cherry picked from commit 6d90f5d0ae928320e6e4ce9fce8e658404d8cb72)

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