$NetBSD$

Fix unportable test(1) construct.

--- configure.orig	2013-10-31 22:34:13.000000000 +0000
+++ configure
@@ -16520,7 +16520,7 @@ fi
 
 
 
-if test "x${XSLTPROC}" == "x"; then
+if test "x${XSLTPROC}" = "x"; then
 	as_fn_error $? "Please install xsltproc before trying to build swfmill" "$LINENO" 5
 fi
 
