Fix undefined name "sys"

Same as open-source-parsers#299 (bca0eff), but an earlier
commit needed to be rebased.

Author: mnaberez

devtools/fixeol.py

@@ -5,6 +5,7 @@
 
 from __future__ import print_function
 import os.path
+import sys
 
 def fix_source_eol(path, is_dry_run = True, verbose = True, eol = '\n'):
     """Makes sure that all sources have the specified eol sequence (default: unix)."""