bug#45826: SBCL / Common Lisp packages fail to build on aarch64

[Leo Famulari]

On Sun, Jan 17, 2021 at 10:29:49AM +0100, Mathieu Othacehe wrote:
> If we want to disable SBCL builds temporarily we can do something
> similar to what I did to disable Rust builds on non-x86_64 architectures
> here: 0ed631866cc0b7cece2b0a0b50e39b37ae91bb67.

------
diff --git a/gnu/packages/rust.scm b/gnu/packages/rust.scm
index 35a96b5754..91b5d6b6ec 100644
--- a/gnu/packages/rust.scm
+++ b/gnu/packages/rust.scm
@@ -452,6 +452,7 @@ test = { path = \"../libtest\" }
             (variable "LIBRARY_PATH")
             (files '("lib" "lib64")))))
 
+    (supported-systems '("x86_64-linux"))
     (synopsis "Compiler for the Rust programming language")
     (description "Rust is a systems programming language that provides memory
 safety and thread safety guarantees.")
------

Hm, this would also prevent users from building the packages on their
own machines. We need a way to make changes like this but limit them to
the build farm.