$NetBSD: patch-configure,v 1.1 2019/07/28 15:22:56 nia Exp $

Use portable test operator.

--- configure.orig	2016-07-30 01:31:53.000000000 +0000
+++ configure
@@ -12115,7 +12115,7 @@ else
 fi
 
 
-if test "x$WARNINGS" == "xyes"; then :
+if test "x$WARNINGS" = "xyes"; then :
   CFLAGS="$CFLAGS -Wall -Wextra \
      -Waggregate-return \
      -Wdeclaration-after-statement \