iirfilter: add fate test

Change the test program to output text instead of binary files so
it can be compared easily in FATE.

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 1024 insertions, 0 deletions

diff --git a/tests/ref/fate/iirfilter b/tests/ref/fate/iirfilter
new file mode 100644
index 0000000..2e5902d
--- /dev/null
+++ b/tests/ref/fate/iirfilter
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