fate/image: Use TRANSCODE where appropriate

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

tests/fate/image.mak

@@ -337,7 +337,7 @@ fate-jpg-12bpp: CMD = framecrc -idct simple -i $(TARGET_SAMPLES)/jpg/12bpp.jpg -
 FATE_JPG += fate-jpg-jfif
 fate-jpg-jfif: CMD = framecrc -idct simple -i $(TARGET_SAMPLES)/jpg/20242.jpg
 
-FATE_JPG_TRANSCODE-$(call ENCDEC, MJPEG PNG, IMAGE2) += fate-jpg-icc
+FATE_JPG_TRANSCODE-$(call TRANSCODE, MJPEG, MJPEG IMAGE_JPEG_PIPE, IMAGE_PNG_PIPE_DEMUXER PNG_DECODER SCALE_FILTER) += fate-jpg-icc
 fate-jpg-icc: CMD = transcode png_pipe $(TARGET_SAMPLES)/png1/lena-int_rgb24.png mjpeg "-vf scale" "" "" "-show_frames"
 
 FATE_JPG-$(call DEMDEC, IMAGE2, MJPEG) += $(FATE_JPG)
@@ -389,7 +389,7 @@ FATE_PNG_PROBE += fate-png-side-data
 fate-png-side-data: CMD = run ffprobe$(PROGSSUF)$(EXESUF) -show_frames \
     -i $(TARGET_SAMPLES)/png1/lena-int_rgb24.png
 
-FATE_PNG_TRANSCODE-$(call ENCDEC, PNG, IMAGE2) += fate-png-icc
+FATE_PNG_TRANSCODE-$(call TRANSCODE, PNG, IMAGE2 IMAGE_PNG_PIPE) += fate-png-icc
 fate-png-icc: CMD = transcode png_pipe $(TARGET_SAMPLES)/png1/lena-int_rgb24.png image2 "-c png" "" "" "-show_frames"
 
 FATE_PNG-$(call DEMDEC, IMAGE2, PNG) += $(FATE_PNG)