fix: New style exception

Use new style exceptions so that it works in both Python 2 and 3. Doing the
same as previous commit, but in a different file.

Refs: nodejs#1817 (comment)

gyp/pylib/gyp/common.py

@@ -622,7 +622,7 @@ def IsCygwin():
             stderr=subprocess.STDOUT)
     stdout,stderr = out.communicate()
     return "CYGWIN" in stdout
-  except Exception, e:
+  except Exception:
     return False