XF86keysym.h: reserve a range for Linux kernel keysyms

The Linux kernel adds a few evdev keycodes roughly every other release. These
aren't available as keysyms through XKB until they have been added as keycode
in xkeyboard-config and mapped there to a newly defined keysym in the X11
proto headers.

In the past, this was done manually,  a suitable keysym was picked at
random and the mapping updated accordingly. This doesn't scale very well and,
given we have a large reserved range for XF86 keysyms anyway, can be done
easier.

Let's reserve the range 0x10081XXX range for a 1:1 mapping of Linux kernel
codes. That's 4095 values, the kernel currently uses only 767 anyway. The
lower 3 bytes of keysyms within that range have to match the kernel value to
make them easy to add and search for. Nothing in X must care about the actual
keysym value anyway.

Since we expect this to be parsed by other scripts for automatic updating, the
format of those #defines is quite strict. Add a script to generate keycodes as
well as verify that the existing ones match the current expected format.

The script is integrated into the CI and meson test, so we will fail if an
update breaks the expectations.

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

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