Don't add a symlink for killall --- it's broken.

(Breakage described in http://b/22331310.)

Bug: http://b/22402103
Change-Id: I8ba017476def0537f0036ddbc7438bbc822619f8
diff --git a/Android.mk b/Android.mk
index fa54f05..645da6d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -263,7 +263,6 @@
     inotifyd \
     insmod \
     kill \
-    killall \
     load_policy \
     ln \
     logname \