Re: doc: Mention rand and srand limitations

[Bruno Haible]

I wrote:
> Results: OK on all platforms, except
> 
> FreeBSD 13.2  Expected value #7504 not found in multithreaded results. (4 
> failures among 100 runs)
> macOS 12.5    Expected value #31 not found in multithreaded results.
> Solaris 10    Expected value #95981 not found in multithreaded results.
> Solaris 11.4  Expected value #55372 not found in multithreaded results.
> OpenBSD 7.4   rand() is non-deterministic.
> Cygwin 3.4.6  rand() is non-deterministic.

And also:

musl libc 3.18  Expected value #13730 not found in multithreaded results. (3 
failures among 100 runs)
NetBSD 9.3      Expected value #751169 not found in multithreaded results. (1 
failure among 1000 runs)
AIX 7.1         Expected value #952507 not found in multithreaded results. (96 
failures among 100 runs)

Bruno