updated for version 7.4.292
Problem:    Searching for "a" does not match accented "a" with new regexp
	    engine, does match with old engine. (David Bürgin)
	    "ca" does not match "ca" with accented "a" with either engine.
Solution:   Change the old engine, check for following composing character
	    also for single-byte patterns.
Added tag v7-4-292 for changeset 60cdaa05a6ad