$NetBSD: patch-configure,v 1.1 2021/07/22 15:58:49 jperkin Exp $

Shell portability.

--- configure.orig	2021-06-02 06:20:17.000000000 +0000
+++ configure
@@ -4181,7 +4181,7 @@ fi
 
 case "$with_hiredis" in #(
   yes) :
-    if test "$HIREDIS_LIBS" == ""; then
+    if test "$HIREDIS_LIBS" = ""; then
 pkg_failed=no
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for hiredis" >&5
 printf %s "checking for hiredis... " >&6; }