Blackberry: Don't build the generic and dummy plugins.
Blackberry: Don't build the generic and dummy plugins.

Change-Id: I12b14975bae9bf834f82e0f04d72baa9b506cbef
Reviewed-by: Lorn Potter <0e329dfd61bdd4e2b2b708a31f12f199a7656feb@nokia.com>

mer-qt/qtsensors,mer-qt/qtsensors,richardmg/qtsensors,kobolabs/qtsensors,richardmg/qtsensors,richardmg/qtsensors,mer-qt/qtsensors,kobolabs/qtsensors,mer-qt/qtsensors,kobolabs/qtsensors,richardmg/qtsensors,mer-qt/qtsensors,richardmg/qtsensors,kobolabs/qtsensors