bug#27536: Add SRFI 71.

[Ludovic Courtès]

Hello,

Christopher Allan Webber <address@hidden> skribis:

> SRFI 71 has a pretty cool syntax for assigning multiple values, and I
> wanted to use it!  So here it is, ported to Guile.
>
> I've already assigned Guile copyright papers, as you probably know.
>
> From 373aad0f4ee6bde7e34f8b6b74c85be132df108b Mon Sep 17 00:00:00 2001
> From: Christopher Allan Webber <address@hidden>
> Date: Thu, 29 Jun 2017 17:19:06 -0500
> Subject: [PATCH] Add SRFI 71: Extended LET-syntax for multiple values.
>
> * module/srfi/srfi-71.scm: New file.
> * module/srfi/Makefile.am: Add it.
> * doc/ref/srfi-modules.texi: Document it.
> * NEWS: Update.

I would prefer if there was a tiny test file under test-suite/tests.
Otherwise LGTM.

Could you add such a file?

Thank you!

Ludo’.