gnu: openexr: Update to 2.2.1 [security fixes].

Fixes CVE-2017-{9110,9111,9112,9113,9114,9115,9116}.

* gnu/packages/graphics.scm (openexr): Update to 2.2.1.

gnu/packages/graphics.scm

@@ -305,14 +305,14 @@ graphics.")
 (define-public openexr
   (package
     (name "openexr")
-    (version "2.2.0")
+    (version "2.2.1")
     (source (origin
               (method url-fetch)
               (uri (string-append "mirror://savannah/openexr/openexr-"
                                   version ".tar.gz"))
               (sha256
                (base32
-                "0ca2j526n4wlamrxb85y2jrgcv0gf21b3a19rr0gh4rjqkv1581n"))
+                "1kdf2gqznsdinbd5vcmqnif442nyhdf9l7ckc51410qm2gv5m6lg"))
               (modules '((guix build utils)))
               (snippet
                '(begin