seperate downloading of the hardened malloc.

scripts/download_malloc.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+set -e
+set -x
+
+cd "$(dirname "$0")"
+DIR="$(dirname "$0")"
+cd ..
+echo $PWD
+
+#downloading graphene malloc
+if [ ! -f ./dependencies/hardened_malloc/Makefile ]; then
+   cd ./dependencies/
+   git clone https://github.com/GrapheneOS/hardened_malloc.git
+fi
+
+echo 'graphene malloc downloaded.'