configure: remove handling of "wav" audio driver

This looks like a leftover that was never implemented.
Signed-off-by: NCleber Rosa <crosa@redhat.com>
Reviewed-by: NLaurent Vivier <laurent@vivier.eu>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190207193605.25676-2-crosa@redhat.com>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>

configure

@@ -3350,10 +3350,6 @@ for drv in $audio_drv_list; do
       oss_libs="$oss_lib"
     ;;
 
-    wav)
-    # XXX: Probes for CoreAudio, DirectSound
-    ;;
-
     *)
     echo "$audio_possible_drivers" | grep -q "\<$drv\>" || {
         error_exit "Unknown driver '$drv' selected" \