gnu: libotr: Fix tests on mips64el.

* gnu/packages/patches/libotr-test-auth-fix.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/messaging.scm (libotr)[source]: Add patch.

gnu-system.am

@@ -582,6 +582,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/libevent-dns-tests.patch			\
   gnu/packages/patches/libmtp-devices.patch			\
   gnu/packages/patches/liboop-mips64-deplibs-fix.patch		\
+  gnu/packages/patches/libotr-test-auth-fix.patch		\
   gnu/packages/patches/liblxqt-include.patch			\
   gnu/packages/patches/libmad-armv7-thumb-pt1.patch		\
   gnu/packages/patches/libmad-armv7-thumb-pt2.patch		\

gnu/packages/messaging.scm

@@ -70,7 +70,9 @@
                                   version ".tar.gz"))
               (sha256
                (base32
-                "1x8rliydhbibmzwdbyr7pd7n87m2jmxnqkpvaalnf4154hj1hfwb"))))
+                "1x8rliydhbibmzwdbyr7pd7n87m2jmxnqkpvaalnf4154hj1hfwb"))
+              (patches
+               (list (search-patch "libotr-test-auth-fix.patch")))))
     (build-system gnu-build-system)
     (propagated-inputs
      `(("libgcrypt" ,libgcrypt)))  ; libotr headers include gcrypt.h

gnu/packages/patches/libotr-test-auth-fix.patch

@@ -0,0 +1,15 @@
+Initialize the context in 'test_auth_clear'.
+Fixes the test suite on mips64el.
+
+Patch by Mark H Weaver <mhw@netris.org>
+
+--- libotr-4.1.1/tests/unit/test_auth.c.orig	2015-12-25 12:39:45.000000000 -0500
++++ libotr-4.1.1/tests/unit/test_auth.c	2016-03-17 18:53:10.169999706 -0400
+@@ -67,6 +67,7 @@
+ 	OtrlAuthInfo *auth = &ctx.auth;
+ 
+ 	/* API call. */
++	otrl_auth_new(&ctx);
+ 	otrl_auth_clear(auth);
+ 
+ 	ok(auth->authstate == OTRL_AUTHSTATE_NONE &&