FATE: add fate test for minterpolate filter

have tested on linux x86_32/64, mingw32/64 arm & mips qemu
Tested-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

tests/fate/filter-video.mak

@@ -122,6 +122,10 @@ FATE_FILTER-$(call ALLYES, FRAMERATE_FILTER TESTSRC2_FILTER FORMAT_FILTER) += fa
 fate-filter-framerate-12bit-up: CMD = framecrc -lavfi testsrc2=r=50:d=1,format=pix_fmts=yuv422p12le,framerate=fps=60 -t 1 -pix_fmt yuv422p12le
 fate-filter-framerate-12bit-down: CMD = framecrc -lavfi testsrc2=r=60:d=1,format=pix_fmts=yuv422p12le,framerate=fps=50 -t 1 -pix_fmt yuv422p12le
 
+FATE_FILTER-$(call ALLYES, MINTERPOLATE_FILTER TESTSRC2_FILTER) += fate-filter-minterpolate-up fate-filter-minterpolate-down
+fate-filter-minterpolate-up: CMD = framecrc -lavfi testsrc2=r=2:d=10,framerate=fps=10 -t 1
+fate-filter-minterpolate-down: CMD = framecrc -lavfi testsrc2=r=2:d=10,framerate=fps=1 -t 1
+
 FATE_FILTER_VSYNTH-$(CONFIG_BOXBLUR_FILTER) += fate-filter-boxblur
 fate-filter-boxblur: CMD = framecrc -c:v pgmyuv -i $(SRC) -vf boxblur=2:1
 

tests/ref/fate/filter-minterpolate-down

+#tb 0: 1/1
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 320x240
+#sar 0: 1/1
+0,          0,          0,        1,   115200, 0x3744b3ed

tests/ref/fate/filter-minterpolate-up

+#tb 0: 1/10
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 320x240
+#sar 0: 1/1
+0,          0,          0,        1,   115200, 0x3744b3ed
+0,          1,          1,        1,   115200, 0xec1fdfa0
+0,          2,          2,        1,   115200, 0xa17f0d74
+0,          3,          3,        1,   115200, 0xd72532a9
+0,          4,          4,        1,   115200, 0x032e60f8
+0,          5,          5,        1,   115200, 0x6e318ba0
+0,          6,          6,        1,   115200, 0x76018292
+0,          7,          7,        1,   115200, 0x89e27599
+0,          8,          8,        1,   115200, 0x68536eac
+0,          9,          9,        1,   115200, 0xc3ac62a8