MFC r259132,r259133,r259143:
	Per the resolution of POSIX bug 0000779 (note 0002050) add support for using 'i'
	as a case insensitive flag.

	Add regression test for recently added 'i' flag in r259132.

	the i modifier was added in r259132 since POSIX recently agreed to add
	it. Switch uses of /I to /i.

PR:		standards/184641