fix python3 compatibility problem in decode-stacktrace

Author: luelistan

tools/decode-stacktrace.py

@@ -47,6 +47,6 @@ def extractAddresses(data):
             line = "\r\n".join(addresses)+"\r\n"
 #             line = line.ljust(125," ")
 
-            pipe.stdin.write(line)
+            pipe.stdin.write(line.encode('ascii'))
             pipe.stdin.flush()