bitbake: fetch/wget: improve proxy object

The connection cache class uses a dummy file object but it doesn't have a closed
attribute, so we can't use it in a context manager.

(Bitbake rev: 7b072ef91d16331eae11bd60f229ce1f0c175995)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/wget.py

@@ -250,6 +250,7 @@ class Wget(FetchMethod):
                         return ""
                     def close(self):
                         pass
+                    closed = False
 
                 resp = addinfourl(fp_dummy(), r.msg, req.get_full_url())
                 resp.code = r.status