opencv: conditionalized some build options
opencv: conditionalized some build options

sigma-embedded/elito-org.openembedded.meta,sigma-embedded/elito-org.openembedded.meta,sigma-embedded/elito-org.openembedded.meta,sigma-embedded/elito-org.openembedded.meta,sigma-embedded/elito-org.openembedded.meta,sigma-embedded/elito-org.openembedded.meta,sigma-embedded/elito-org.openembedded.meta