bitbake: bitbake: Strip old editor directives from file headers

There are much better ways to handle this and most editors shouldn't need this
in modern times, drop the noise from the files. Its not consitently applied
anyway.

(Bitbake rev: 5e43070e3087d09aea2f459b033d035c5ef747d0)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/COW.py

@@ -1,5 +1,3 @@
-# ex:ts=4:sw=4:sts=4:et
-# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
 #
 # This is a copy on write dictionary and set which abuses classes to try and be nice and fast.
 #