makekeys: handle the new _EVDEVK xorgproto symbols

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.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
4 jobs for wip/handle-evdevk-syms in 8 minutes and 33 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Prep
passed check-commits #12180903

00:00:32

passed container-prep #12180904

00:00:11

 
  Build
passed build #12180905

00:07:25

 
  Deploy
passed check-merge-request #12180906

00:00:35