rekahsoft-gnu: Correct an issue impacting terraform-provider-null@2.1.2

rekahsoft-gnu/packages/terraform.scm

@@ -178,6 +178,7 @@ instead of @command{terraform-MAJOR.MINOR}.")))
      (substitute-keyword-arguments (package-arguments package)
        ((#:phases phases '%standard-phases)
         `(modify-phases ,phases
+           (delete 'change-out) ; Delete phase if it already exists
            (add-after 'install 'change-out
              (lambda* (#:key outputs #:allow-other-keys)
                (let* ((out (assoc-ref outputs "out"))