[xiphos-source] [crosswire/xiphos] 1c1826: avoid deprecated g_type_class_add_private (#962)

[Wu Xiaotian]

  Branch: refs/heads/master
  Home:   https://github.com/crosswire/xiphos
  Commit: 1c1826a3c256ff456f23bf77110d1cc6286e2a66
      https://github.com/crosswire/xiphos/commit/1c1826a3c256ff456f23bf77110d1cc6286e2a66
  Author: Wu Xiaotian <yetist at gmail.com>
  Date:   2019-09-08 (Sun, 08 Sep 2019)

  Changed paths:
    M src/webkit/wk-html.c
    M src/webkit/wk-html.h
    M src/xiphos_html/xiphos_html.h

  Log Message:
  -----------
  avoid deprecated g_type_class_add_private (#962)