Daniel James 7853cc1d04 Boostbook: Fix for libxslt 1.27.0.
libxslt now seems to think that $uppercase-letters and $lowercase-letters are
undefined at this point. I'm not sure if it's right, or if this is a regression
in libxslt, but it's easy enough to get working, and while it isn't ideal, it
isn't too problematic.

[SVN r81386]
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