PR modula2/120253: Error message column numbers should start at 1 not 0

PR modula2/120253: Error message column numbers should start at 1 not 0

This patch ensures that column numbers start at 1 rather than 0.

gcc/m2/ChangeLog:

	PR modula2/120253
	* m2.flex (FIRST_COLUMN): New define.
	(updatepos): Remove commented code.
	(consumeLine): Assign column to FIRST_COLUMN.
	(initLine): Ditto.
	(m2flex_GetColumnNo): Return FIRST_COLUMN if currentLine is NULL.
	(m2flex_GetLineNo): Rewrite for positive logic.
	(m2flex_GetLocation): Ditto.

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