Suppress UninstantiatedParamaterizedTest error

Suppressed UninstantiatedParamaterizedTestSuite<SumSSETest> error.

BUG=aomedia:2827

Change-Id: Id0ec951c76dbfb4885d6b9bd12887bb5125f722c
diff --git a/test/sse_sum_test.cc b/test/sse_sum_test.cc
index a9a1572..3e24e89 100644
--- a/test/sse_sum_test.cc
+++ b/test/sse_sum_test.cc
@@ -84,6 +84,8 @@
   ACMRandom rnd_;
 };
 
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(SumSSETest);
+
 void SumSSETest::RunTest(int isRandom) {
   for (int k = 0; k < kNumIterations; k++) {
     const int width = 4 * (rnd_(31) + 1);   // Up to 128x128