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

[Jonathan Wakely]

On 30/07/20 13:37 -0400, Josh Marshall via Libstdc++ wrote:
>Which branch should I be branching off of to develop from?  Master
>looks like it is having compile failures:

The master branch is the right one.

It looks like you're using guix, which seems to be broken by design as
far as I can tell.

The strtof function is not detected during configure:
https://lists.gnu.org/archive/html/guix-devel/2020-06/msg00131.html

You might want to consider using an OS that can configure libstdc++
properly if you plan to work on libstdc++.

I've committed the attached patch to master, which should fix those
errors.

Tested x86_64-linux, committed to master.

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