modula2: M2MetaError.{def,mod} and P2SymBuild.mod further cleanup

Further cleanups and improve the wording of an error message.

gcc/m2/ChangeLog:

	* gm2-compiler/M2MetaError.mod (op): Corrected ordering.
	* gm2-compiler/P2SymBuild.def: Remove comment.
	* gm2-compiler/P2SymBuild.mod (GetComparison): Replace
	the word less with fewer.

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