For some reason modules/input adds the C code that is generated by
wayland-scanner to EXTRA_DIST. This results in a race where depending
on the timestamps of the tarball and the timestamp of the system
wayland-protocols either the generated source in the tarball or a
regenerated source will be used.
This doesn't actually impact the code generated, but it does break
reproducible builds as the list of source files changes.
1bc6f7ef47