scripts: Add utolf.py helper script.

Converts line endings to lf.

scripts/utolf.py

@@ -0,0 +1,22 @@
+#/usr/bin/env python3
+
+import os
+import sys
+
+def main():
+    filenames = sys.argv[1:]
+    if filenames:
+        convert(filenames)
+    else:
+        print("Usage: <command> filename [filename ...]")
+
+def convert(files):
+    for file in files:
+        print(file)
+        with open(file, 'r') as infile, \
+             open(file + '.tmp', 'w', newline='\n') as outfile:
+            outfile.writelines(infile.readlines())
+        os.replace(file + '.tmp', file)
+
+if __name__ == "__main__":
+    main()