xlldrv/keyboard.c: Report of typos

[Andrew Talbot]

I believe there are numerous typos in this file. Starting at line 310, there
seem to be several missing double quotes; they break compilation if
-Wwrite-strings is specified. I was going to assume the missing quotes to
be the only factor and fix things myself. But as there are some
non-printing characters in there that I don't understand, I thought I would
mention it here, instead, so that someone who knows about keyboard layouts
might fix these arrays properly.

-- Andy.