Adding new keysyms

[Alexander Larsson]

I've been fixing up the keyboard mappings for my MacBook
(https://bugs.freedesktop.org/show_bug.cgi?id=8068), and they now seem
mostly ok. However, I'm missing useful keysyms for some of the keys on
the keyboard. It has more than one key to manage lcd brightness, and
there are keys to modify the keyboard backlight.

So, I want to propose the new keysyms:
XF86BrightnessUp, XF86BrightnessDown, XF86KeyboardLightOff,
XF86KeyboardLightDown, XF86KeyboardLightUp

These are prefixed with XF86 to match the rest of the custom ones, even
though this is not XFree86 anymore.

What do people think about this?

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 Alexander Larsson                                            Red Hat, Inc 
                   alexl at redhat.com    alla at lysator.liu.se 
He's an old-fashioned pirate vagrant on the edge. She's a time-travelling 
foul-mouthed widow from a family of eight older brothers. They fight crime!