Fix guile-fibers resource leakguile-fibers-fix-resource-leak

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This adds a patch to guile-fibers to fix a resource leak that caused
file descriptors to be opened and never closed with each invocation of
`run-fibers'.  This is presumably what was causing the tests to fail, as
guile will abort when it gets EMFILE while attempting to create a new
thread.  I've verified that it builds on my system, but it's only a
4-core machine, and the rate at which file descriptors leak scales with
the number of cores, so it's possible it would have built successfully
here regardless.  Could someone with access to a system with more cores
verify that it now builds properly there?

Hopefully a bug fix release will show up soon enough and we can get rid
of this.

- reepca

From 659fa6b70cb8364187753e240076cdb107320070 Mon Sep 17 00:00:00 2001
From: Caleb Ristvedt <caleb.ristvedt@cune.org>
Date: Thu, 21 May 2020 20:30:58 -0500
Subject: [PATCH] gnu: guile-fibers: Add patch to fix resource leak.

guile-fibers@1.0.0 has a resource leak where run-fibers will only destroy one
scheduler, but it creates as many as there are cpu cores by default (see
https://github.com/wingo/fibers/issues/36).  This causes the tests to fail on
systems with many cores, and can cause guile to crash under certain
circumstances.  This fixes that resource leak.  At present neither git master
nor the latest release has fixed this yet.

* gnu/packages/patches/guile-fibers-destroy-peer-schedulers.patch: new patch.
* gnu/local.mk: add it to the list of patches.
* gnu/packages/guile-xyz.scm (guile-fibers): use it.

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