build: remove wayland-version.h.in from EXTRA_DIST

All the foo.in files are in the tarball, as long as their foo
counterparts are listed in AC_CONFIG_FILES

For example - *.pc.in, Makefile.in files, etc.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>