libedit: remove FETCHCMD append
This dates from when upstream was for some reason refusing the wget user agent,
but this isn't the case anymore:
$ wget http://www.thrysoee.dk/editline/libedit-
20190324-3.1.tar.gz
...
HTTP request sent, awaiting response... 200 OK
Length: 521999 (510K) [application/x-gzip]
Saving to: ‘libedit-
20190324-3.1.tar.gz’
2019-09-03 11:53:20 (1.22 MB/s) - ‘libedit-
20190324-3.1.tar.gz’ saved [521999/521999]
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
