gnu: cuirass: Pass "--localstatedir=/var".

* gnu/packages/ci.scm (cuirass)[arguments]: Add #:configure-flags.

gnu/packages/ci.scm

@@ -68,6 +68,8 @@ (define-public cuirass
                     (ice-9 rdelim)
                     (ice-9 popen))
 
+         #:configure-flags '("--localstatedir=/var") ;for /var/log/cuirass
+
          #:phases
          (modify-phases %standard-phases
            (add-after 'unpack 'disable-repo-tests