lavf/assenc: normalize line endings to \n

Previously, we produced output with either \r\n or mixed line endings.
This was undesirable unto itself, but also made working with patches affecting
FATE output particularly challenging, especially via the mailing list.

Everything that consumes the SSA/ASS format is line-ending-agnostic,
so \n is selected to simplify git/ML usage in FATE.

Extra \r characters at the end of a packet are dropped. These are always
ignored by the renderer anyway.

1 files changed, 62 insertions, 62 deletions

diff --git a/tests/ref/fate/sub-ass-to-ass-transcode b/tests/ref/fate/sub-ass-to-ass-transcode
index bfc4e95419..a3a2400be4 100644
--- a/tests/ref/fate/sub-ass-to-ass-transcode
+++ b/tests/ref/fate/sub-ass-to-ass-transcode
@@ -1,62 +1,62 @@
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