Fix C23 issues

[ceamac]

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

[soreau]

Hm, I figured this was caused by latest wayland but apparently it's C23? In any event, #27 might be a cleaner solution.

[NamorNiradnug]

I'm not sure but AFAIK calling a function with wrong number of arguments is UB, i.e. this noop hack is not a valid way of doing the thing.

[bodograumann]

At least it fixes the issue for me. So thanks <3

Used this in the PKBUILD file:

url='https://github.com/ceamac/wdisplays#branch=fix/C23'

[Talanor]

I'm not sure but AFAIK calling a function with wrong number of arguments is UB, i.e. this noop hack is not a valid way of doing the thing.

You're correct (6.3.2.3) :

A pointer to a function of one type may be converted to a pointer to a function of another type and
back again; the result shall compare equal to the original pointer. If a converted pointer is used to
call a function whose type is not compatible with the referenced type, the behavior is undefined

That being said, the fix works on my install as well ;)
A "cleaner" solution might be to make noop variants per pointer types where used.

[artizirk]

Thank you for the fix!