dhcp: fix crossbuild.

srcpkgs/dhcp/template

@@ -2,7 +2,7 @@
 pkgname=dhcp
 _version=4.3.4
 version=${_version//-/.}
-revision=3
+revision=4
 wrksrc="dhcp-${_version}"
 build_style=gnu-configure
 disable_parallel_build=yes
@@ -20,7 +20,8 @@ pre_configure() {
 		--with-srv-lease-file=/var/lib/dhcp/dhcpd.leases
 		--with-srv6-lease-file=/var/lib/dhcp/dhcpd6.leases
 		--with-cli-lease-file=/var/lib/dhclient/dhclient.leases
-		--with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases"
+		--with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases
+		--with-randomdev=/dev/random"
 	local cargs="$(echo $configure_args | tr '\n' ' ')"
 
 	# patching bind Makefile to patch with a cross fix while building (WTF?!)