fate/subtitles: Ignore line endings for sub-scc test

Since 7bf1b9b3,
the test produces ordinary \n, yet this is not what the reference
file used for the most time, leading to test failures.
Reviewed-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

tests/fate/subtitles.mak

@@ -114,6 +114,7 @@ fate-sub-charenc: CMD = fmtstdout ass -sub_charenc cp1251 -i $(TARGET_SAMPLES)/s
 
 FATE_SUBTITLES-$(call DEMDEC, SCC, CCAPTION) += fate-sub-scc
 fate-sub-scc: CMD = fmtstdout ass -ss 57 -i $(TARGET_SAMPLES)/sub/witch.scc
+fate-sub-scc: CMP = diff
 
 FATE_SUBTITLES-$(call DEMMUX, SCC, SCC) += fate-sub-scc-remux
 fate-sub-scc-remux: CMD = fmtstdout scc -i $(TARGET_SAMPLES)/sub/witch.scc -ss 4:00 -map 0 -c copy