Augment ANDROID_DEV_SCRIPTS with prebuilts/devtools/tools

Change-Id: Ia3647674f294c42e9fbe2163bf0d70012313bb15
diff --git a/envsetup.sh b/envsetup.sh
index 274e02e..63a29e9 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -157,7 +157,7 @@
 
     export ANDROID_TOOLCHAIN=$ANDROID_EABI_TOOLCHAIN
     export ANDROID_QTOOLS=$T/development/emulator/qtools
-    export ANDROID_DEV_SCRIPTS=$T/development/scripts
+    export ANDROID_DEV_SCRIPTS=$T/development/scripts:$T/prebuilts/devtools/tools
     export ANDROID_BUILD_PATHS=$(get_build_var ANDROID_BUILD_PATHS):$ANDROID_QTOOLS:$ANDROID_TOOLCHAIN$ARM_EABI_TOOLCHAIN_PATH$CODE_REVIEWS:$ANDROID_DEV_SCRIPTS:
     export PATH=$ANDROID_BUILD_PATHS$PATH