frame_resize_test: fix -Wunused-const-variable warning

Protect `kFrameDim` with `#if HAVE_AVX2 || HAVE_SSE2`. Since the test
uses the _c implementation as the reference there is no point in adding
a C instantiation.

Change-Id: I9eafd7384261bc29675385e7ed938b75972d5218

test/frame_resize_test.cc

diff --git a/test/frame_resize_test.cc b/test/frame_resize_test.cc
index b0bcb7b..7a4da45 100644
--- a/test/frame_resize_test.cc
+++ b/test/frame_resize_test.cc
@@ -29,13 +29,6 @@
 
 typedef tuple<int, int> FrameDimension;
 
-// Resolutions (width x height) to be tested for resizing.
-const FrameDimension kFrameDim[] = {
-  make_tuple(3840, 2160), make_tuple(2560, 1440), make_tuple(1920, 1080),
-  make_tuple(1280, 720),  make_tuple(640, 480),   make_tuple(640, 360),
-  make_tuple(256, 256),
-};
-
 // Check that two 8-bit output buffers are identical.
 void AssertOutputBufferEq(const uint8_t *p1, const uint8_t *p2, int width,
                           int height) {
@@ -143,6 +136,15 @@
 
 TEST_P(AV1ResizeYTest, DISABLED_SpeedTest) { SpeedTest(); }
 
+#if HAVE_AVX2 || HAVE_SSE2
+// Resolutions (width x height) to be tested for resizing.
+const FrameDimension kFrameDim[] = {
+  make_tuple(3840, 2160), make_tuple(2560, 1440), make_tuple(1920, 1080),
+  make_tuple(1280, 720),  make_tuple(640, 480),   make_tuple(640, 360),
+  make_tuple(256, 256),
+};
+#endif
+
 #if HAVE_AVX2
 INSTANTIATE_TEST_SUITE_P(
     AVX2, AV1ResizeYTest,