Fix a compile warning when SSE and NEON are unused

Change-Id: Iec99278acc84902c581e8c5672b436b9a0974a4f
diff --git a/test/av1_round_shift_array_test.cc b/test/av1_round_shift_array_test.cc
index 825d134..181a394 100644
--- a/test/av1_round_shift_array_test.cc
+++ b/test/av1_round_shift_array_test.cc
@@ -27,9 +27,11 @@
 
 typedef void (*comp_round_shift_array_func)(int32_t *arr, int size, int bit);
 
+#if HAVE_SSE4_1 || HAVE_NEON
 const int kValidBitCheck[] = {
   -4, -3, -2, -1, 0, 1, 2, 3, 4,
 };
+#endif  // HAVE_SSE4_1 || HAVE_NEON
 
 typedef ::testing::tuple<comp_round_shift_array_func, BLOCK_SIZE, int>
     CompRoundShiftParam;