Guard against Windows line endings on Windows too.

run_tests.py

@@ -92,13 +92,14 @@ def run_tests():
     [run_test(t) for t in objctests]
 
 def check_file(fname):
+    if fname.endswith('parsetab.py'): # Autogenerated
+        return True
     linenum = 0
-    is_sane = not environment.is_windows()
     for line in open(fname, 'rb').readlines():
         if b'\t' in line:
             print("File %s contains a literal tab on line %d. Only spaces are permitted." % (fname, linenum))
             sys.exit(1)
-        if is_sane and b'\r' in line:
+        if b'\r' in line:
             print("File %s contains DOS line ending on line %d. Only unix-style line endings are permitted." % (fname, linenum))
             sys.exit(1)
         linenum += 1