Add simple runner script for DFU host app

This script performs the environment setup before executing the DFU app.

module_dfu/host/xmos_dfu_osx/run_xmosdfu.sh

@@ -0,0 +1,9 @@
+#! /bin/bash
+
+#find out were we are running from so we only exec this program
+PROGDIR=`dirname $0`
+
+#setup environment
+export DYLD_LIBRARY_PATH=$PROGDIR:$DYLD_LIBRARY_PATH
+
+$PROGDIR/xmosdfu $1 $2 $3