Update prebuilts to ab/2774618

external/ninja sha 02c5c0c

Bug: 27499941
Change-Id: Iee2c27768da6d3ddb7402409af1ffe3c309d4874
diff --git a/ninja b/ninja
index 0460cb5..4d9e2c6 100755
--- a/ninja
+++ b/ninja
Binary files differ