makekeys: handle the new _EVDEVK xorgproto symbols

Peter Hutterer requested to merge whot/libx11:wip/handle-evdevk-syms into master

These keys are all defined through a macro in the form: #define XF86XK_BrightnessAuto _EVDEVK(0x0F4)

The _EVDEVK macro is simply an offset of 0x10081000. Let's parse these lines correctly so those keysyms end up in our hashtables.

Fixes #137 (closed)

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