The attached patch updates lcrq to 0.2.4.

It fixes an issue where packets are sent with zero data, as confusing as
that may be, it is enjoyably explained by upstream:

  https://chaos.social/@dentangle/114397068112541120

The dependents lcsync and librecast all build nicely.

  ./pre-inst-env guix build --no-grafts --dependents lcrq
  guix build: computing dependents of package lcrq@0.2.4...
  /gnu/store/bg0acil25iqipmznll1795k4hqxg25bm-lcrq-0.2.4
  /gnu/store/fqa2524s8yh7wn46sasb7gx0v9w690di-librecast-0.10.0
  /gnu/store/6s5fjiwh733297m42xv0sqqrrl84dwwj-lcsync-0.3.2

live well,
  vagrant