gcc 15 is more strict and compiles C by default with C23. `noop` is
used as a default null initializer, but now it must have the correct
type, so add a cast.
See also: https://bugs.gentoo.org/946954
Changes to protocols aren't forward-compatible. It's not possible to use
version n+1 when a client has been designed to work with version n. For
instance in wlr-screencopy v5 a new event has been added. Binding to
version 5 without upgrading the client leads to libwayland errors
because libwayland doesn't know how to handle the event.
The client needs to maintain its own version requirements.
Closes: https://github.com/cyclopsian/wdisplays/issues/18
