PR modula2/122009: Rename local variables to avoid warnings and add const char

PR modula2/122009: Rename local variables to avoid warnings and add const char

This patch renames local variables in M2WIDESET.mod to avoid compile time
warnings.  It also fixes the parameter declaration in BuildEnumerator to
include the const modifier.

gcc/m2/ChangeLog:

	PR modula2/122009
	* gm2-compiler/M2GCCDeclare.mod (PrintKnown): Remove.
	* gm2-gcc/m2type.cc (m2type_BuildEnumerator): Add const modifier.
	* gm2-gcc/m2type.def (BuildEnumerator): Use ConstCharStar type.
	* gm2-gcc/m2type.h (m2type_BuildEnumerator): Add const modifier.
	* gm2-libs/M2WIDESET.mod (ShiftLeftByteBit): Rename variable to
	as toIdx.
	Rename variable from as fromIdx.
	(ShiftRightByteBit): Rename variable to as toIdx.
	Rename variable from as fromIdx.
	(RotateLeft): Rename variable to as toIdx.
	Rename variable from as fromIdx.
	(ArithShiftLeftBit): Rename set to setb.
	(ArithShiftRightBit): Rename set to setb.

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