bionic: Teach fnmatch(3) to handle UTF-8 characters in patterns

bionic: Teach fnmatch(3) to handle UTF-8 characters in patterns

This is NOT comprehensive UTF-8 support.  It is just a quick hack to
make alternation work in bracket expressions so that the system file
manager can find files with non-ASCII names in root mode.  Bracket
expressions that contain non-ASCII ranges are explicitly avoided to
avoid the complexities of unicode collation rules.

Things like the following will now work:

	fnmatch("те[с][т].jpg", "тест.jpg", 0);
	fnmatch("test[αβγ].txt", "testβ.txt", 0);

Things like the following will still fail:

	fnmatch("тес[а-я].txt", "тест.txt", 0);

Jira: CYNGNOS-2336

Change-Id: If38dc6692bc22d20128b0cd8a7632754a496d7fb