Work around AMS book unicode issue?

[Scott Kostyshak]

The attached patch works around an AMS book unicode issue, as discussed here:

  https://tex.stackexchange.com/questions/671116/how-to-find-and-fix-the-origin-of-invalid-unicode-character-generated-by-lyx

Disadvantage of the workaround is the added dependency, textcase.sty, which is not needed for AMS book documents without unicode. If this is a problem, I suppose we could add a new layout flag that, if activated, loads textcase if there is unicode.

Attached is an example .lyx file that does not compile without the patch and does compile with the patch.

Thoughts?

By the way, should the "amsbook" dependency in \DeclareLaTeXClass be there regardless of this patch?

Scott
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