Merge branch 'jc/test-say-color-avoid-echo-escape' into maint

The "say" function in the test scaffolding incorrectly allowed
"echo" to interpret "\a" as if it were a C-string asking for a BEL
output.

* jc/test-say-color-avoid-echo-escape:
  test-lib: Fix say_color () not to interpret \a\b\c in the message

t/test-lib.sh

@@ -230,7 +230,7 @@ else
 	say_color() {
 		test -z "$1" && test -n "$quiet" && return
 		shift
-		echo "$*"
+		printf "%s\n" "$*"
 	}
 fi