Use autoconf's endian check instead of the locally defined check
so that we can determine the endianess without having to compile
a program.

Idea from http://www.security-lists.org/lists/libnet/2003/03/00001.html

Also remove the old test from aclocal.m4.

--- libnet/configure.in	2005/11/15 03:49:30	1.1
+++ libnet/configure.in	2005/11/15 03:50:29
@@ -7,6 +7,7 @@
 dnl Process this file with autoconf to produce a configure script.
 
 
+AC_PREREQ(2.52)
 AC_INIT(src/libnet_build_ip.c)
 LIBNET_VERSION=`cat VERSION`
 AC_MSG_RESULT(beginning autoconfiguration process for libnet-$LIBNET_VERSION...)
@@ -29,7 +30,16 @@
 dnl And some custom things
 dnl
 
-AC_LIBNET_ENDIAN_CHECK
+AC_C_BIGENDIAN([
+ AC_DEFINE(LIBNET_BIG_ENDIAN)
+ ENDIANESS="LIBNET_BIG_ENDIAN"
+ LIBNET_CONFIG_DEFINES="$LIBNET_CONFIG_DEFINES -DLIBNET_BIG_ENDIAN"
+],[
+ AC_DEFINE(LIBNET_LIL_ENDIAN)
+ ENDIANESS="LIBNET_LIL_ENDIAN"
+ LIBNET_CONFIG_DEFINES="$LIBNET_CONFIG_DEFINES -DLIBNET_LIL_ENDIAN"
+], AC_MSG_WARN(cannot detect endianess. try setting ac_cv_c_bigendian to yes or no)) 
+
 AC_LBL_UNALIGNED_ACCESS
 dnl AC_LBL_LIBRARY_NET
 
--- libnet/aclocal.m4	2005/11/15 04:02:01	1.1
+++ libnet/aclocal.m4	2005/11/15 04:03:43
@@ -279,87 +279,6 @@
 
 
 dnl
-dnl Checks endianess
-dnl
-dnl usage:
-dnl
-dnl     AC_LIBNET_ENDIAN_CHECK
-dnl
-dnl results:
-dnl
-dnl     LIBNET_BIG_ENDIAN = 1   or
-dnl     LIBNET_LIL_ENDIAN = 1
-dnl
-
-AC_DEFUN(AC_LIBNET_ENDIAN_CHECK,
-    [AC_MSG_CHECKING(machine endianess)
-
-    cat > conftest.c << EOF
-#       include <stdio.h>
-#       include <stdlib.h>
-
-        int main()
-        {
-            union
-            {
-                short s;
-                char c[[sizeof(short)]];
-            } un;
-
-            un.s = 0x0102;
-            if (sizeof (short) == 2)
-            {
-                if (un.c [[0]] == 1 && un.c [[1]] == 2)
-                {
-                    printf("B\n");
-                }
-                else
-                {
-                    if (un.c [[0]] == 2 && un.c [[1]] == 1)
-                    {
-                        printf("L\n");
-                    }
-                }
-            }
-            else
-            {
-                printf("?\n");
-            }
-            return (EXIT_SUCCESS);
-        }
-EOF
-        ${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS conftest.c $LIBS > /dev/null 2>&1
-        # Oopz 4.3 BSD doesn't have this.  Sorry.
-        if test ! -x conftest ; then
-dnl failed to compile for some reason
-            ac_cv_libnet_endianess=unknown
-        else
-            ./conftest > conftest.out
-            result=`cat conftest.out`
-            if test $result = "B"; then
-                ac_cv_libnet_endianess=big
-            elif test $result = "L"; then
-                ac_cv_libnet_endianess=lil
-            else
-                ac_cv_libnet_endianess=unknown
-            fi                                
-        fi
-        rm -f conftest* core core.conftest
-
-        AC_MSG_RESULT($ac_cv_libnet_endianess)
-
-        if test $ac_cv_libnet_endianess = big ; then
-            AC_DEFINE(LIBNET_BIG_ENDIAN)
-            ENDIANESS="LIBNET_BIG_ENDIAN"
-            LIBNET_CONFIG_DEFINES="$LIBNET_CONFIG_DEFINES -DLIBNET_BIG_ENDIAN"
-        elif test $ac_cv_libnet_endianess = lil ; then
-            AC_DEFINE(LIBNET_LIL_ENDIAN)
-            ENDIANESS="LIBNET_LIL_ENDIAN"
-            LIBNET_CONFIG_DEFINES="$LIBNET_CONFIG_DEFINES -DLIBNET_LIL_ENDIAN"
-        fi
-    ])
-
-dnl
 dnl Improved version of AC_CHECK_LIB
 dnl
 dnl Thanks to John Hawkinson (jhawk@mit.edu)