[Bug libstdc++/96731] uniform_int_distribution requirement that its type is_integral is too strict

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96731

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Tony E Lewis from comment #0)
> I can't see any obvious mention of constraints on
> uniform_­int_­distribution's IntType in
> http://eel.is/c++draft/rand.dist.uni.int

See http://eel.is/c++draft/rand#req.genl-1.5