Fix build on alpha.

--- mpi/longlong.h.orig	Wed Jun  8 18:18:15 2016
+++ mpi/longlong.h	Wed Jun 15 23:15:28 2016
@@ -174,6 +174,7 @@ MA 02111-1307, USA. */
     (pl) = __m0 * __m1; 						\
   } while (0)
 # define UMUL_TIME 46
+#if 0
 # ifndef LONGLONG_STANDALONE
 #  define udiv_qrnnd(q, r, n1, n0, d) \
   do { UDItype __r;							\
@@ -183,6 +184,7 @@ MA 02111-1307, USA. */
 extern UDItype __udiv_qrnnd ();
 #  define UDIV_TIME 220
 # endif /* !LONGLONG_STANDALONE */
+#endif /* 0 */
 #endif /* __alpha */
 
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