package/libxkbcommon: bump to version 0.10.0 and convert to meson

package/libxkbcommon: bump to version 0.10.0 and convert to meson

Since version 0.9.x the autotools build system is removed from libxkbcommon
([1]), so convert to meson build system.

Remove the CFLAGS force of '-std=gnu99', believing meson sets it
automatically (a test build used '-std=c99').

For details see [1].

[1] https://lists.freedesktop.org/archives/wayland-devel/2019-October/040962.html

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Reviewed-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>