initramfs-tools: add systemd hook, missed in previous.

srcpkgs/initramfs-tools/files/hooks/systemd

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+PREREQ=""
+
+prereqs()
+{
+	echo "$PREREQ"
+}
+
+case $1 in
+# get pre-requisites
+prereqs)
+	prereqs
+	exit 0
+	;;
+esac
+
+. ${ROOTDIR}/usr/share/initramfs-tools/hook-functions
+
+# we need systemd-timestamp
+copy_exec ${ROOTDIR}/lib/systemd/systemd-timestamp /bin
+
+exit 0