scripts: update makeheader script for the _EVDEVK keysym defines

scripts: update makeheader script for the _EVDEVK keysym defines

As of xorgproto commit 5dbb5b76597f [1], the 0x10081XXX keycode range is defined
for direct evdev kernel keycode mapping. For example, KEY_MACRO1 (0x290) is
mapped to 0x10081290. The format of the #define lines for these keys is
stable to allow for parsing:

  #define XF86XK_FooBar _EVDEVK(0x123) /* optional comment */

Update our script so we detect these new lines. Our keysym generation is a
two-step process: makeheader and then makekeys. Replacing the key with its full
value in the makeheader script means we don't have to update makekeys to handle
the _EVDEVK macro and our header file is fully resolved.

[1] https://gitlab.freedesktop.org/xorg/proto/xorgproto/-/merge_requests/23

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