$NetBSD: patch-configure,v 1.1 2022/12/07 08:04:42 adam Exp $

Portablility fixes.

--- configure.orig	2022-12-07 07:55:53.000000000 +0000
+++ configure
@@ -3397,7 +3397,7 @@ arith_code=0
 # Check whether --with-arith was given.
 if test "${with_arith+set}" = set; then :
   withval=$with_arith;
-	if test $withval == yes; then
+	if test $withval = yes; then
 	   arith_code=1
 	fi
 
@@ -4167,7 +4167,7 @@ fi
 
 fi
 
-if test $arith_code == 1 -a $jpegoptim_cv_arith_code_support = yes; then
+if test $arith_code = 1 -a $jpegoptim_cv_arith_code_support = yes; then
   arith_code_status="Enabled"
   $as_echo "#define HAVE_ARITH_CODE 1" >>confdefs.h