First time contributor, adding p1004 for C++20 -- constexpr std::vector

[Jonathan Wakely]

On 30/07/20 16:35 -0400, Josh Marshall wrote:
>I know the guix guys got it working somehow.

I only know what I saw in that mailing list archive, so I don't know
if they've solved it.

>Is this something that
>patches would be accepted for from them in order to build without a
>hitch?

Of course.