fate: add xvid test for custom matrices

Test sample is made from the sample in Bug-Id: videolan/7411

tests/Makefile

@@ -108,6 +108,7 @@ include $(SRC_PATH)/tests/fate/vpx.mak
 include $(SRC_PATH)/tests/fate/vqf.mak
 include $(SRC_PATH)/tests/fate/wavpack.mak
 include $(SRC_PATH)/tests/fate/wma.mak
+include $(SRC_PATH)/tests/fate/xvid.mak
 
 FATE_AVCONV += $(FATE_AVCONV-yes)
 FATE-$(CONFIG_AVCONV) += $(FATE_AVCONV)

tests/fate/xvid.mak

+fate-xvid-custom-matrix: CMD = framemd5 -i $(TARGET_SAMPLES)/mpeg4/xvid_vlc_trac7411.h263
+
+FATE_XVID-$(call DEMDEC, M4V, MPEG4) += fate-xvid-custom-matrix
+FATE_SAMPLES_AVCONV += $(FATE_XVID-yes)
+
+fate-xvid: $(FATE_XVID-yes)

tests/ref/fate/xvid-custom-matrix

+#tb 0: 1/25
+0,          1,          1,        1,   622080, fec19d49e4433046ac5f7a9f3dff2078
+0,          2,          2,        1,   622080, 77aa1a369ce3e180648eaccce95cb618
+0,          3,          3,        1,   622080, d3ff08bc77e247a4b033d37ff780c2a2
+0,          4,          4,        1,   622080, 362c6b7411f23134880b4ceeaf09aafb
+0,          5,          5,        1,   622080, 52ba7f7611160ed9516a3b94dd889254
+0,          6,          6,        1,   622080, e11bf4956dfa43a760cdb8a6c46201eb
+0,          7,          7,        1,   622080, 5305b5775b9481b136e84c0f1c2c52c7
+0,          8,          8,        1,   622080, 65510ff0135a41e5acc99071893c99b2
+0,          9,          9,        1,   622080, cab3a8991f0d404bb42386efb430abc7
+0,         10,         10,        1,   622080, b7a8305768527a9b54248e620a5e7117
+0,         11,         11,        1,   622080, 67adbfe7c321a2a74244d2a268de598a
+0,         12,         12,        1,   622080, 9bcaed10aa15b8a5278c5c4840cfb9c8
+0,         13,         13,        1,   622080, 0e3065f441313496cb390ba1a6c92b11
+0,         14,         14,        1,   622080, f741816f762c000fc6fa77d9d1d96cdc
+0,         15,         15,        1,   622080, 259686747b597c168440d5cfe75cdfbf
+0,         16,         16,        1,   622080, d37341f0bea41b6d0421e984cd079673
+0,         17,         17,        1,   622080, 97428665f84e4364bdba768ad604bcdc
+0,         18,         18,        1,   622080, 8c32ce967ee34df1ccbdf4e8b6aa8c8d
+0,         19,         19,        1,   622080, 7fee903f21d29d6d8215fc04c8b3af34
+0,         20,         20,        1,   622080, 3d67c55cc62f0308cd4549c7ac46081a