$NetBSD$

Replace invalid shell conditional "==" with "=" in configure

--- configure.ac.orig	2017-05-03 09:11:09.000000000 +0200
+++ configure.ac	2017-05-03 09:11:14.000000000 +0200
@@ -184,7 +184,7 @@
 
 dnl If runtime loading has been disabled, add OpenSSL and PAM as hard
 dnl dependencies.
-if test "x$enable_runtime_loading" == xno; then
+if test "x$enable_runtime_loading" = xno; then
   dnl Link against OpenSSL libraries, unless SSL support has been disabled
   if test "x$enable_ssl" != xno; then
     AC_CHECK_HEADER(openssl/bio.h,