Use NDK 15c
Use NDK 15c

Summary: To match internal config.

Reviewed By: emilsjolander

Differential Revision: D5986512

fbshipit-source-id: e523ce21f8dcdfd95ed1a0d1f1ec5f6f19035ac6

facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho