[travis] correct build option
[travis] correct build option

Reviewed By: mbouaziz

Differential Revision: D5293495

fbshipit-source-id: 2dbd0ab

jvillard/infer,facebook/infer,jvillard/infer,blzq/infer,ropas/infer,ropas/infer,facebook/infer,facebook/infer,blzq/infer,jvillard/infer,jvillard/infer,jvillard/infer,blzq/infer,ropas/infer,facebook/infer,blzq/infer,facebook/infer,jvillard/infer,facebook/infer,blzq/infer,facebook/infer,blzq/infer,ropas/infer,ropas/infer,jvillard/infer,ropas/infer