fate: Use a oneoff test for the tremolo filter

The tremolo filter uses floating point internally, and uses
multiplication factors derived from sin(fmod()), neither of
which is bitexact for use with framecrc.

This fixes running this test when built with for mingw/x86_32
with clang.

In this case, a 1 ulp difference in the output from fmod() would
end up in an output from the filter that differs by 1 ulp, but
which makes the lrint() in swresample/audioconvert.c round in a
different direction.
Signed-off-by: Martin Storsjö <martin@martin.st>

tests/fate/filter-audio.mak

@@ -186,10 +186,13 @@ FATE_AFILTER_SAMPLES-$(call FILTERDEMDECENCMUX, STEREOTOOLS, WAV, PCM_S16LE, PCM
 fate-filter-stereotools: SRC = $(TARGET_SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav
 fate-filter-stereotools: CMD = framecrc -i $(SRC) -frames:a 20 -af stereotools=mlev=0.015625
 
-FATE_AFILTER-$(call FILTERDEMDECENCMUX, TREMOLO, WAV, PCM_S16LE, PCM_S16LE, WAV) += fate-filter-tremolo
+FATE_AFILTER_SAMPLES-$(call FILTERDEMDECENCMUX, TREMOLO, WAV, PCM_S16LE, PCM_S16LE, WAV) += fate-filter-tremolo
 fate-filter-tremolo: tests/data/asynth-44100-2.wav
 fate-filter-tremolo: SRC = $(TARGET_PATH)/tests/data/asynth-44100-2.wav
-fate-filter-tremolo: CMD = framecrc -i $(SRC) -frames:a 20 -af tremolo
+fate-filter-tremolo: CMD = ffmpeg -i $(SRC) -frames:a 20 -af tremolo -f wav -f s16le -
+fate-filter-tremolo: REF = $(SAMPLES)/filter/tremolo.pcm
+fate-filter-tremolo: CMP = oneoff
+fate-filter-tremolo: CMP_UNIT = s16
 
 FATE_AFILTER-$(call FILTERDEMDECENCMUX, COMPAND, WAV, PCM_S16LE, PCM_S16LE, WAV) += fate-filter-compand
 fate-filter-compand: tests/data/asynth-44100-2.wav

tests/ref/fate/filter-tremolo

-#tb 0: 1/44100
-#media_type 0: audio
-#codec_id 0: pcm_s16le
-#sample_rate 0: 44100
-#channel_layout 0: 3
-#channel_layout_name 0: stereo
-0,          0,          0,     1024,     4096, 0x5d3be907
-0,       1024,       1024,     1024,     4096, 0xea151fbe
-0,       2048,       2048,     1024,     4096, 0xa5bc19f4
-0,       3072,       3072,     1024,     4096, 0x8706ec6d
-0,       4096,       4096,     1024,     4096, 0x334ff275
-0,       5120,       5120,     1024,     4096, 0xcd0ff7ad
-0,       6144,       6144,     1024,     4096, 0x29a1e9c9
-0,       7168,       7168,     1024,     4096, 0x1d41e77f
-0,       8192,       8192,     1024,     4096, 0x99e7fe07
-0,       9216,       9216,     1024,     4096, 0x4bbf09ce
-0,      10240,      10240,     1024,     4096, 0x94600236
-0,      11264,      11264,     1024,     4096, 0xc8af0c9e
-0,      12288,      12288,     1024,     4096, 0x70eef88f
-0,      13312,      13312,     1024,     4096, 0xb222ec47
-0,      14336,      14336,     1024,     4096, 0x1071ee27
-0,      15360,      15360,     1024,     4096, 0x7c390bd2
-0,      16384,      16384,     1024,     4096, 0x68bdf655
-0,      17408,      17408,     1024,     4096, 0x810cfacb
-0,      18432,      18432,     1024,     4096, 0x9639e41f
-0,      19456,      19456,     1024,     4096, 0xa30be70f