selinux: add tools to dev path

Adds audit2allow to the path. No build required.

Bug: 21724977
Change-Id: Ide320a56b9cdbfa426b978443f6df07fa2a38fbc
diff --git a/envsetup.sh b/envsetup.sh
index bd46b59..65a536e 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -175,7 +175,7 @@
             ;;
     esac
 
-    export ANDROID_DEV_SCRIPTS=$T/development/scripts:$T/prebuilts/devtools/tools
+    export ANDROID_DEV_SCRIPTS=$T/development/scripts:$T/prebuilts/devtools/tools:$T/external/selinux/prebuilts/bin
     export ANDROID_BUILD_PATHS=$(get_build_var ANDROID_BUILD_PATHS):$ANDROID_TOOLCHAIN:$ANDROID_TOOLCHAIN_2ND_ARCH:$ANDROID_KERNEL_TOOLCHAIN_PATH$ANDROID_DEV_SCRIPTS:
 
     # If prebuilts/android-emulator/<system>/ exists, prepend it to our PATH