gyp: fix sntex error

PR-URL: #1333
Reviewed-By: Refael Ackermann <[email protected]>

Author: cclauss

gyp/pylib/gyp/mac_tool.py

@@ -127,7 +127,7 @@ def _DetectInputEncoding(self, file_name):
     fp = open(file_name, 'rb')
     try:
       header = fp.read(3)
-    except e:
+    except Exception:
       fp.close()
       return None
     fp.close()