fixes to be able to use libedit instead of readline; see also bug #448408

Index: ntp-4.2.6p1+dfsg/libntp/ntp_lineedit.c
===================================================================
--- ntp-4.2.6p1+dfsg.orig/libntp/ntp_lineedit.c	2010-02-09 10:01:25.000000000 +0000
+++ ntp-4.2.6p1+dfsg/libntp/ntp_lineedit.c	2010-05-24 10:27:56.000000000 +0000
@@ -16,8 +16,8 @@
 # undef HAVE_READLINE_HISTORY
 #endif
 #if defined(HAVE_READLINE_HISTORY)
-# include <readline/readline.h>
-# include <readline/history.h>
+# include <editline/readline.h>
+# include <editline/history.h>
 # define LE_READLINE
 #elif defined(HAVE_HISTEDIT_H)
 # include <histedit.h>