mlang: accept character set names like ISO8859-1

[Dan Kegel]

Accept names both with and without dash after ISO.

Fixes http://bugs.winehq.org/show_bug.cgi?id=13340

The ugly string comparison could be avoided by
canonicalizing the input character set name,
though that would mean making a copy.  Would
you prefer it that way instead?

This doesn't change the miserable status of the
mlang tests on XP:
http://test.winehq.org/data/200805211000/#group_XP:mlang:mlang
-------------- next part --------------
A non-text attachment was scrubbed...
Name: mlang.patch
Type: text/x-patch
Size: 2865 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20080521/8e11745c/attachment.bin