vp9: add fate test for bilinear MC filter.

Sample at:
http://downloads.webmproject.org/test_data/libvpx/vp90-2-06-bilinear.webmSigned-off-by: Michael Niedermayer <michaelni@gmx.at>

tests/fate/vpx.mak

@@ -99,6 +99,7 @@ $(foreach SHARP,$(VP9_SHARP),$(eval $(call FATE_VP9_SUITE,01-sharpness-$(SHARP),
 $(foreach W,$(VP9_SIZE_A),$(eval $(foreach H,$(VP9_SIZE_A),$(eval $(call FATE_VP9_SUITE,02-size-$(W)x$(H),$(1),$(2))))))
 $(foreach W,$(VP9_SIZE_B),$(eval $(foreach H,$(VP9_SIZE_B),$(eval $(call FATE_VP9_SUITE,03-size-$(W)x$(H),$(1),$(2))))))
 $(eval $(call FATE_VP9_SUITE,03-deltaq,$(1),$(2)))
+$(eval $(call FATE_VP9_SUITE,06-bilinear,$(1),$(2)))
 $(eval $(call FATE_VP9_SUITE,2pass-akiyo,$(1),$(2)))
 $(eval $(call FATE_VP9_SUITE,parallelmode-akiyo,$(1),$(2)))
 $(eval $(call FATE_VP9_SUITE,segmentation-aq-akiyo,$(1),$(2)))

tests/ref/fate/vp9-06-bilinear

+#format: frame checksums
+#version: 1
+#hash: MD5
+#tb 0: 1001/30000
+#stream#, dts,        pts, duration,     size, hash
+0,          0,          0,        1,   152064, 818a5af531c921ae58dfedc75234f3c5
+0,          1,          1,        1,   152064, f863f8c68b5c87c721d345c5a894336d
+0,          2,          2,        1,   152064, 3f1213e44db416530bc0717f0a795b5d
+0,          3,          3,        1,   152064, 4b99c16a62c3d6687c78236fa13e1f41
+0,          4,          4,        1,   152064, 80f23a3f04215dd7542128e7c53d68d0
+0,          5,          5,        1,   152064, b40b7aa34a77fe773d82d75b5bdd9c13
+0,          6,          6,        1,   152064, dd4af6263d20bbaf9afedb6695c1ba67
+0,          7,          7,        1,   152064, 1f2ccf88f15c10e3c27b2368dacc3727
+0,          8,          8,        1,   152064, 232b027c4e9b598f50d078bb7b7a165e
+0,          9,          9,        1,   152064, 2b44367332aa0fe42362d61f18e7f8dd