r2400: make ms_fnmatch() case insensitive. This is much more efficient than

r2400: make ms_fnmatch() case insensitive. This is much more efficient than
uppercasing the two whole strings before the call is made, is less
error-prone, and also copes with strings where the upper case version
is longer than the lower case version due to different multi-byte lengths.
(This used to be commit e227ac1edfd48596a9d5096b6965ddd0beb969a5)