Add file/update Makefile for ppc64 VSX

Makefile

diff --git a/Makefile b/Makefile
index 06c8fbb..bb74edc 100644
--- a/Makefile
+++ b/Makefile
@@ -26,6 +26,9 @@
 else
 ifdef HH_POWER
 HH_X64 =
+HIGHWAYHASH_OBJS += obj/hh_vsx.o
+HIGHWAYHASH_TEST_OBJS += obj/highwayhash_test_vsx.o
+VECTOR_TEST_OBJS += obj/vector_test_vsx.o
 else
 HH_X64 = 1
 HIGHWAYHASH_OBJS += obj/hh_avx2.o obj/hh_sse41.o

highwayhash/vector_test_vsx.cc

diff --git a/highwayhash/vector_test_vsx.cc b/highwayhash/vector_test_vsx.cc
new file mode 100644
index 0000000..cea58f7
--- /dev/null
+++ b/highwayhash/vector_test_vsx.cc
@@ -0,0 +1,19 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// WARNING: this is a "restricted" source file; avoid including any headers
+// unless they are also restricted. See arch_specific.h for details.
+
+#define HH_TARGET_NAME VSX
+#include "highwayhash/vector_test_target.cc"