Compatible with older python

tools/addr2line.py

@@ -13,7 +13,7 @@ for line in lines:
     match = re.search('#([0-9]+) PC: (0x[0-9A-F]+) FP: (0x[0-9A-F]+)', line)
     if match:
         addr = match.group(2)
-        process = subprocess.run([addrline, '-e', 'target/{0}/{1}/rcore'.format(arch, mode), '-f', '-C', addr], capture_output=True)
+        process = subprocess.run([addrline, '-e', 'target/{0}/{1}/rcore'.format(arch, mode), '-f', '-C', addr], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         res = process.stdout.decode('utf-8')
         print('#{0} PC: {1} FP: {3} {2}'.format(match.group(1), match.group(2), res.strip(), match.group(3)))
     else: