Fix syntax

Author: silverwind

tools/utils.py

@@ -73,7 +73,7 @@ def GuessOS():
 def GuessArchitecture():
   id = platform.machine()
   id = id.lower()  # Windows 7 capitalizes 'AMD64'.
-  if id.startswith('armv6') # Can return 'armv6l'.
+  if id.startswith('armv6'): # Can return 'armv6l'.
     return 'armv6'
   elif id.startswith('arm') or id == 'aarch64':
     return 'arm'