XF86keysyms.h: add some keycodes from kernels 2.6.11 and earlier

These keysyms were already present in 2.6.11 which is the first tag in git.

A few notes on specific keys here:
- KEY_EJECTCLOSECD is theoretically different to XF86XK_Eject (kernel
  KEY_EJECTCD) but the actual usage in the hwdb remappings seems to be
  random. Either way it's already mapped to XF86XK_Eject in
  symbols/inet so let's just add an entry for the sake of documenting it.
- XF86XK_CycleAngle seems like the best match for KEY_ANGLE

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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