Fix: autoheader error

On linux:

autoheader: warning: missing template: BSD_NETISRSCHED
autoheader: Use AC_DEFINE([BSD_NETISRSCHED], [], [Description])
autoheader: warning: missing template: CLICK_STATS
autoheader: warning: missing template: CLICK_VERSION
autoheader: warning: missing template: CLICK_VERSION_CODE
autoheader: warning: missing template: CLICK_WARP9
autoheader: warning: missing template: FREEBSD_INCLUDEDIR
autoheader: warning: missing template: HAVE_ADAPTIVE_SCHEDULER
autoheader: warning: missing template: HAVE_BSDMODULE_DRIVER
autoheader: warning: missing template: HAVE_BSD_POLLING
autoheader: warning: missing template: HAVE_CLICKFS
autoheader: warning: missing template: HAVE_CLICK_BSD_KERNEL
autoheader: warning: missing template: HAVE_CLICK_KERNEL
autoheader: warning: missing template: HAVE_CLICK_KERNEL_TX_NOTIFY
autoheader: warning: missing template: HAVE_EXPAT
autoheader: warning: missing template: HAVE_INTEL_CPU
autoheader: warning: missing template: HAVE_IP6
autoheader: warning: missing template: HAVE_IPSEC
autoheader: warning: missing template: HAVE_KERNEL_ASSERT
autoheader: warning: missing template: HAVE_LINUXMODULE_DRIVER
autoheader: warning: missing template: HAVE_LINUXMODULE_MULTITHREAD
autoheader: warning: missing template: HAVE_LINUX_DEVINET_IOCTL
autoheader: warning: missing template: HAVE_LINUX_DEV_IOCTL
autoheader: warning: missing template: HAVE_LINUX_FILES_LGLOCK
autoheader: warning: missing template: HAVE_LINUX_FILES_LOCK
autoheader: warning: missing template: HAVE_LINUX_GETBOOTTIME
autoheader: warning: missing template: HAVE_LINUX_GET_MONOTONIC_COARSE
autoheader: warning: missing template: HAVE_LINUX_INET_CTL_SOCK_CREATE
autoheader: warning: missing template: HAVE_LINUX_INET_IOCTL
autoheader: warning: missing template: HAVE_LINUX_KTIME_H
autoheader: warning: missing template: HAVE_LINUX_NETDEV_RX_HANDLER_REGISTER
autoheader: warning: missing template: HAVE_LINUX_READ_NET_SKBCOUNT
autoheader: warning: missing template: HAVE_LINUX_SB_LOCK
autoheader: warning: missing template: HAVE_LINUX_STRLEN_EXPOSED
autoheader: warning: missing template: HAVE_LINUX_TULIP_INTERRUPT_HOOK
autoheader: warning: missing template: HAVE_PROPER
autoheader: warning: missing template: HAVE_STRIDE_SCHED
autoheader: warning: missing template: HAVE_TASK_HEAP
autoheader: warning: missing template: HAVE_USERLEVEL_DRIVER
autoheader: warning: missing template: HAVE_USER_MULTITHREAD
autoheader: warning: missing template: LINUX_SRCDIR
autoheader: warning: missing template: __MTCLICK__
autoreconf: /usr/bin/autoheader failed with exit status: 1

Signed-off-by: Gregory Detal <gregory.detal@uclouvain.be>