Update prebuilts to ab/2774618

external/ninja sha 02c5c0c

Bug: 27499941
Change-Id: I2b7faeac9a09b0f353f3055aac2f0c5b899558a9
diff --git a/ninja b/ninja
index 088369f..d281508 100755
--- a/ninja
+++ b/ninja
Binary files differ