opkg: Fix opkglibdir for target opkg

* EXTRA_OECONF in original recipe was using ${localstatedir} for taget and
  ${target_localstatedir} for native and nativesdk, so overwritting
  target_localstatedir is not enough for target recipe

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@palm.com>
Change-Id: I520a4c4b732dafba3929c41783c3d34f7ca4029a
Reviewed-on: http://g2g.palm.com/1496
Reviewed-by: Martin Jansa <martin.jansa@palm.com>
Tested-by: Martin Jansa <martin.jansa@palm.com>
Reviewed-by: Build Verification
Reviewed-by: Herb Kuta <herb.kuta@palm.com>
Reviewed-by: Steve Lemke <steve.lemke@palm.com>
Reviewed-by: Susan Montooth <susan.montooth@palm.com>