Hi Guix,

The tagged 2.2.7 version of sbcl has some issues.  For instance, maxima
failed to build.

This patch updates sbcl while ensuring that all packages that depend on
it build successfully.  I tested it by issuing

--8<---------------cut here---------------start------------->8---
./pre-inst-env guix build $(./pre-inst-env guix refresh -l sbcl | cut -d ':' -f 2)
--8<---------------cut here---------------end--------------->8---

Find the patched attached.  Thanks.

-- 
André A. Gomes
"You cannot even find the ruins..."