Make libarect buildable for native_bridge

Also make headers available for RenderScript.

Bug: http://b/153609531

Test: m libarect.native_bridge

Change-Id: Iee387d19d167d8b90f4bf3fae7869ea370025b9a
Merged-In: Iee387d19d167d8b90f4bf3fae7869ea370025b9a
3 files changed