$NetBSD$

Fix unportable test(1) construct.

--- configure.orig	2013-01-23 21:26:47.000000000 +0000
+++ configure
@@ -16775,13 +16775,13 @@ fi
 
 if test "$with_endianness" != "no"; then
 
-  if test "$with_endianness" == "little"; then
+  if test "$with_endianness" = "little"; then
 
     is_little_endian=1
 
 else
 
-    if test "$with_endianness" == "big"; then
+    if test "$with_endianness" = "big"; then
 
       is_little_endian=0
 
