lint: check-derivation: Catch all exceptions.

Rather than raising the exception.

I'm looking at this as the linux-module-build-system is broken in such a way
that this causes the derivation linter to error.  With this change, it
correctly reports the issue.

* guix/lint.scm (check-derivation): Catch all exceptions.

guix/lint.scm

@@ -1348,7 +1348,11 @@ descriptions maintained upstream."
                                  (formatted-message-arguments c))))
                  (make-warning package
                                (G_ "failed to create ~a derivation: ~a")
-                               (list system str)))))
+                               (list system str))))
+              (else
+               (make-warning package
+                             (G_ "failed to create ~a derivation: ~a")
+                             (list system c))))
       (parameterize ((%graft? #f))
         (package-derivation store package system #:graft? #f)