JDK-8168935 changes the --patch-module option to emit a warning if the module is unknown, consistent with other --add-* options.

$ java --patch-module foo=bar
WARNING: Unknown module: foo specified in --patch-module

The configure script needs to be updated to filter this warning:

 $ECHO "Check if jvm arg is ok: --patch-module foo=bar" >&5
  $ECHO "Command: $JAVA --patch-module foo=bar -version" >&5
  OUTPUT=`$JAVA --patch-module foo=bar -version 2>&1`
  FOUND_WARN=`$ECHO "$OUTPUT" | $GREP -i warn`
  FOUND_VERSION=`$ECHO $OUTPUT | $GREP " version \""`
  if test "x$FOUND_VERSION" != x && test "x$FOUND_WARN" = x; then
    dummy="$dummy --patch-module foo=bar"
    JVM_ARG_OK=true
  else
    $ECHO "Arg failed:" >&5
    $ECHO "$OUTPUT" >&5
    JVM_ARG_OK=false
  fi