scripts: oe-run-native, fix *-native directories

This fixes a crash with "find" when running a native tool and *-native
directories do not exist under the binary directory in the sysroot.
This happened because the directory wildcard was passed as part of the
root directory.
The directory wildcard is now passed by "-name", which returns an empty
result if no matching directory.

Signed-off-by: Adrian Herrera <adrian.herrera@arm.com>
Change-Id: Iba7acd8bbd7e0beb4d25c984f6af7a4fd21486e6
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit f6c90ed0)
Signed-off-by: Steve Sakoman <steve@sakoman.com>