gnu: guile-fibers: Add (fibers io-wakeup).

This patch is required by gnunet-scheme.  It has been submitted upstream at
<https://github.com/wingo/fibers/pull/50>, but there has not been any response
so far.

* gnu/packages/patches/guile-fibers-wait-for-io-readiness.patch: New file.
* gnu/packages/guile-xyz.scm (guile-fibers-1.1)[source]{patches}: Add it.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

path: root/etc/substitutes/berlin.guix.gnu.org.pub

(public-key 
 (ecc 
  (curve Ed25519)
  (q #8D156F295D24B0D9A86FA5741A840FF2D24F60F7B6C4134814AD55625971B394#)
  )
 )