tree dce393b9c59a84ffa6ee3cd6e187414c2a2b5bf1
parent 1f7c527ee9f6ee79b772b8fd669602b819d0a330
author Colin Cross <ccross@android.com> 1462404326 -0700
committer Colin Cross <ccross@android.com> 1462404326 -0700

Update path to ninja

ninja has been moved from prebuilts/ninja to prebuilts/build-tools so it
can share the hermetic libc++.so there.

Change-Id: I0b6e76baaa6916a8c7fd19c684b792ccef2f9cb1