Patch hypre to support ppc64le (#3238)

- Patch applies through v2.11.1

var/spack/repos/builtin/packages/hypre/ibm-ppc64le.patch

@@ -0,0 +1,12 @@
+--- hypre-2.11.1/src/config/config.guess	2016-06-09 10:56:18.000000000 -0400
++++ hypre-2.11.1/src/config/config.guess.patch	2017-02-24 22:53:42.718337013 -0500
+@@ -882,6 +882,9 @@
+     ppc64:Linux:*:*)
+ 	echo powerpc64-unknown-linux-gnu
+ 	exit ;;
++    ppc64le:Linux:*:*)
++	echo powerpc64le-unknown-linux-gnu
++	exit ;;
+     alpha:Linux:*:*)
+ 	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
+ 	  EV5)   UNAME_MACHINE=alphaev5 ;;

var/spack/repos/builtin/packages/hypre/package.py

@@ -48,6 +48,9 @@ class Hypre(Package):
             description="Use internal Superlu routines")
     variant('int64', default=False,
             description="Use 64bit integers")
+    
+    # Patch to add ppc64le in config.guess
+    patch('ibm-ppc64le.patch', when='@:2.11.1') 
 
     depends_on("mpi")
     depends_on("blas")