/(?i)\u0149\u0149/ =~ "\u0149\u0149" doesn't match (Issue #40)

'\u0149' is casefolded into '\u02bc' + 'n'.  They were compiled into
'exactn-ic:\xca\xbc' + 'exact1-ic:n'.  One character was divided into
two opcodes, so it couldn't match to a character '\u0149'.
Merge a series of 'exactn-ic' and 'exact1-ic' into one 'exactn-ic'.
(cherry picked from commit 7b61f4b958f54c1c8b7669b4d208af5747473fc0)

Conflicts:

	regcomp.c
Update HISTORY
Merge branch 'onig-5.9.x-mod' into onig-5.9.x-mod_for_bregonig-v2