Fix build issue by configuring the lessc path (#4240)
Fix build issue by configuring the lessc path (#4240)


playi/pxt,playi/pxt,Microsoft/pxt,Microsoft/pxt,switchinnovations/pxt,switchinnovations/pxt,switch-education/pxt,switch-education/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,switchinnovations/pxt,playi/pxt,switch-education/pxt,switchinnovations/pxt,switch-education/pxt,Microsoft/pxt