Update libetpan to current head.

pEp/nightly.scm

@@ -70,9 +70,9 @@ shell provides options to redirect the output into a pipe or a file.")
     (license license:gpl2)))
 
 (define fdik-libetpan
-  (let ((commit "370050956b7ee95b0c3b54c018b40ad1f366683a") ; builds
-	(checksum "0lcqcnij3ray7nssvq0lzb352wmnab8ffzk7dgff2c68mvjbh1l6")
-        (revision "3"))
+  (let ((commit "210ba2b3b310b8b7a6ee4a4e35e50f7fa379643f") ; builds
+	(checksum "0jr4f9l9frk7kdmaf9yz0z2726diz82wlvnd9vfnnl29w7sp2pnq")
+        (revision "4"))
    (package
     (inherit libetpan)
     (name "fdik-libetpan")