meta-tizen: keyutils: define install root dir

meta-tizen: keyutils: define install root dir

The install root dir is defined by the variable "DESTDIR" which was set
to "RPM_BUILD_ROOT". "RPM_BUILD_ROOT" not being set, the package tried
to install itself in the host rootfs. Defining "RPM_BUILD_ROOT" as
"${D}" corrects this issue.

Change-Id: I5ab4ddc586f2ef8fcc23866244a11bc9aa120a56
(From meta-tizen rev: c8b0f70268d10c483dc76125eb27c895691c2dce)

Signed-off-by: Kévin THIERRY <kevin.thierry@open.eurogiciel.org>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>