Use standard autoconf macros instead of our own.

configure.in

@@ -2,7 +2,7 @@ dnl Process this file with autoconf to produce a configure script.
 
 dnl $Id$
 
-AC_PREREQ(2.59)
+AC_PREREQ(2.61)
 AC_INIT
 AC_CONFIG_SRCDIR([src/tincd.c])
 AM_INIT_AUTOMAKE(tinc, 1.0-cvs)
@@ -10,12 +10,12 @@ AC_CONFIG_HEADERS([config.h])
 AM_MAINTAINER_MODE
 
 AM_GNU_GETTEXT([external])
-AM_GNU_GETTEXT_VERSION(0.12.1)
+AM_GNU_GETTEXT_VERSION(0.14.1)
 
 # Enable GNU extensions.
 # Define this here, not in acconfig's @TOP@ section, since definitions
 # in the latter don't make it into the configure-time tests.
-AC_DEFINE([_GNU_SOURCE], 1, [Enable GNU extenstions])
+AC_GNU_SOURCE
 AC_DEFINE([__USE_BSD], 1, [Enable BSD extensions])
 
 ALL_LINGUAS="nl"
@@ -27,8 +27,6 @@ AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_RANLIB
 
-AC_ISC_POSIX
-
 dnl Check and set OS
 
 #AC_CANONICAL_HOST
@@ -124,8 +122,8 @@ AC_TYPE_SIGNAL
 AC_CHECK_FUNCS([asprintf daemon fchmod flock ftime fork get_current_dir_name gettimeofday mlockall putenv random select strdup strerror strsignal strtol system unsetenv vsyslog writev],
   [], [], [#include "have.h"]
 )
-jm_FUNC_MALLOC
-jm_FUNC_REALLOC
+AC_FUNC_MALLOC
+AC_FUNC_REALLOC
 
 dnl Support for SunOS