Fetching directories with p4 worked but single files did not. This
patch from Helmut Auer (helmut.auer@harman.com) fixes that issue.
[YOCTO #7891]
(Bitbake rev: 39da6579901c62a83ed9319c2016c58fbbc108fe)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>