xchat 2.8.6: fix CVE-2009-0315 and a building issues with 2 debian patches and bump PR

xchat 2.8.6: fix CVE-2009-0315 and a building issues with 2 debian patches and bump PR

The building issue was the following:
| fe-gtk.o: In function `fe_gui_info':
| [...]/src/fe-gtk/fe-gtk.c:822: undefined reference to `GTK_WIDGET_VISIBLE'
| menu.o: In function `menu_canacaccel':
| [...]/src/fe-gtk/menu.c:1673: undefined reference to `GTK_WIDGET_IS_SENSITIVE'
| maingui.o: In function `mg_hide_empty_pane':
| [...]/src/fe-gtk/maingui.c:812: undefined reference to `GTK_WIDGET_VISIBLE'
| [...]/src/fe-gtk/maingui.c:813: undefined reference to `GTK_WIDGET_VISIBLE'
| maingui.o: In function `mg_show_generic_tab':
| [...]/src/fe-gtk/maingui.c:602: undefined reference to `GTK_WIDGET_HAS_FOCUS'

I noticied the security issue while looking into the debian patches of xchat:
  They had a file named 46_CVE-2009-0315.dpatch.
  Then I looked at that CVE to see if it was relevant ,and applied the patch