itss: fix handling non-ASCII content paths

Sun Sep 10 20:00:09 CDT 2017

Warning: Attached code is horrible and likely non quite correct...

Yet it makes things work.

Current itss code in wine is a case of turning working code into non-working
one. Namely, code taken from chm_lib during "conversion" to add WCHAR
paths was done a bit blindly. This patch does pretty much the same thing
trying to make things work again.

Tested with a chm file that contains a content file with non-ASCII name.
The stored paths were UTF-8 - I don't know the format, so I just hope
there's no encoding field somewhere, that I've missed; yet, if there is,
wine isn't handling it either.

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