$NetBSD: patch-configure,v 1.2 2020/07/17 17:30:13 riastradh Exp $

Fix shell portability.

https://lists.gforge.inria.fr/pipermail/sollya-devl/2020-July/000018.html

--- configure.orig	2018-09-20 12:01:05.000000000 +0000
+++ configure
@@ -16641,7 +16641,7 @@ $as_echo_n "checking whether help2man su
 $as_echo "$HELP2MAN_SUPPORTS_LOCALE" >&6; }
   rm -rf .tmp_help2man
 fi
- if test "x$HELP2MAN_SUPPORTS_LOCALE" == "xyes"; then
+ if test "x$HELP2MAN_SUPPORTS_LOCALE" = "xyes"; then
   HAVE_HELP2MAN_LOCALE_TRUE=
   HAVE_HELP2MAN_LOCALE_FALSE='#'
 else
