Fix warp filter test with --disable-ssse3
Fix warp filter test with --disable-ssse3

Put the test cases for av1_warp_affine_ssse3 behind a
"#if HAVE_SSSE3" condition

BUG=aomedia:582

Change-Id: Ide55dc1cf6a1d1b0c37db6d17488ac3f8e113888

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom