move enable_localaccount.sh, make pam_offline use it

src/scripts/enable_localaccount.sh

+#!/bin/bash
+
+set -e
+
+if [ -z $1 ]
+then
+  echo "Usage: $0 localaccount_username"
+  exit 1
+fi
+
+echo "Enabling local account $1@gmail.com."
+echo "Remove ../platform/pam_google/pam_localaccount.h and "
+echo "../platform/pam_offline/pam_localaccount.h to disable."
+
+cat <<EOF > ../platform/pam_google/pam_localaccount.h
+// local username for Chrome OS pam
+// This file is auto-generated by enable_localaccount.sh
+
+#ifndef CHROMEOS_PAM_LOCALACCOUNT_H_
+#define CHROMEOS_PAM_LOCALACCOUNT_H_
+
+namespace chromeos_pam {
+const char kLocalAccount[] = "$1@gmail.com";
+}
+
+#endif // CHROMEOS_PAM_LOCALACCOUNT_H_
+EOF
+
+cat <<EOF > ../platform/pam_offline/pam_localaccount.h
+// local username for Chrome OS pam
+// This file is auto-generated by enable_localaccount.sh
+
+#ifndef CHROMEOS_PAM_LOCALACCOUNT_H_
+#define CHROMEOS_PAM_LOCALACCOUNT_H_
+
+namespace pam_offline {
+const char kLocalAccount[] = "$1@gmail.com";
+}
+
+#endif // CHROMEOS_PAM_LOCALACCOUNT_H_
+EOF