ELPA package: don't check threading support during build (#28227)

./configure tries to execute an MPI test, which is not possible on
most HPC platforms (if you don't build on a compute node), so this
check is disabled to allow the build to proceed. Ideally we could
check this by placing constraints on the MPI that Spack builds (e.g.
require building a version that is guaranteed to have threading
support).

var/spack/repos/builtin/packages/elpa/package.py

@@ -177,5 +177,6 @@ def configure_args(self):
             options.append('--enable-autotune-redistribute-matrix')
 
         options.append('--disable-silent-rules')
+        options.append('--without-threading-support-check-during-build')
 
         return options