tests: drop bc dependency

We already have a dependency on awk and bc is sometimes not found in the
base system.

diff --git a/tests/fate-run.sh b/tests/fate-run.sh
index f78e4fcfd5a3faf28eadb4afadd7ce7eff21f96e..c7b292279945152a5f02c942435b9314a94ccdab 100755 (executable)
--- a/tests/fate-run.sh
+++ b/tests/fate-run.sh
@@ -38,7 +38,7 @@ target_path(){
 # $1=value1, $2=value2, $3=threshold
 # prints 0 if absolute difference between value1 and value2 is <= threshold
 compare(){
-    echo "scale=2; v = $1 - $2; if (v < 0) v = -v; if (v > $3) r = 1; r" | bc
+    awk "BEGIN { v=$1-$2; printf ((v<0?-v:v) > $3) }"
 }
 
 do_tiny_psnr(){