$NetBSD$

Fix shell portability.

--- configure.orig	2020-12-01 20:38:33.000000000 +0000
+++ configure
@@ -5150,7 +5150,7 @@ if test "$wxWin" != 1; then
       " "$LINENO" 5
 fi
 
-if test "$enable_alsa" == "yes"; then
+if test "$enable_alsa" = "yes"; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for snd_pcm_open in -lasound" >&5
 $as_echo_n "checking for snd_pcm_open in -lasound... " >&6; }
 if ${ac_cv_lib_asound_snd_pcm_open+:} false; then :