PR-108136 modula-2 meets cppcheck part 2

PR-108136 modula-2 meets cppcheck part 2

R-108136 modula-2 meets cppcheck part 2

This patch addresses the style warnings mentioned in the PR.
The array high style fixes to mc/keyc.mod and
gm2-libs/M2Dependent.mod provoke a rebuild of pge and mc.

gcc/m2/ChangeLog:

	* gm2-libs/Args.mod (GetArg): Check index before
	accessing array.
	* gm2-libs/M2Dependent.mod (toCString): Check index
	before accessing array.
	* mc-boot/GArgs.c: Rebuilt.
	* mc-boot/GM2Dependent.c: Rebuilt.
	* mc-boot/Gkeyc.c: Rebuilt.
	* mc/keyc.mod (seenUIntMin): Initialize once.
	(seenUIntMax): Initialize once.
	(checkLimits): Only test seenUIntMin and seenUIntMax
	once.
	* pge-boot/GArgs.c:  Rebuilt.
	* pge-boot/GM2Dependent.c: Rebuilt.

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