systemd: only run systemd-machine-id-setup if /dev/urandom exists.

srcpkgs/systemd/INSTALL

@@ -1,5 +1,7 @@
 case "${ACTION}" in
 post)
-	[ ! -f etc/machine-id ] && bin/systemd-machine-id-setup
+	if [ -c dev/urandom -a ! -f etc/machine-id ]; then
+		bin/systemd-machine-id-setup
+	fi
 	;;
 esac

srcpkgs/systemd/template

@@ -1,7 +1,7 @@
 # Template file for 'systemd'
 pkgname=systemd
 version=37
-revision=2
+revision=3
 distfiles="http://www.freedesktop.org/software/$pkgname/$pkgname-$version.tar.bz2"
 build_style=gnu_configure
 configure_args="--with-distro=other --with-rootdir=