https://bugs.winehq.org/show_bug.cgi?id=51926
--- Comment #3 from Zebediah Figura z.figura12@gmail.com --- If I just copy a bunch of definitions from old glibc's wait.h and reproduce our statement, I don't get any error:
https://gcc.godbolt.org/z/3WG4r7d7r
So there must be something else going on...