"gtk_status_icon... is deprecated" compiler warnings

[Francis Chin]

The following warnings are seen when compiling v1.2.0:

ui_status.c: In function ‘ui_status_init’:
ui_status.c:50:2: warning: ‘gtk_status_icon_new’ is deprecated [-Wdeprecated-declarations]
  status = gtk_status_icon_new();
  ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:261:0,
                 from ui_status.h:23,
                 from ui_status.c:20:
/usr/include/gtk-3.0/gtk/deprecated/gtkstatusicon.h:84:23: note: declared here
 GtkStatusIcon *gtk_status_icon_new (void);
                       ^
ui_status.c:51:2: warning: ‘gtk_status_icon_set_from_icon_name’ is deprecated [-Wdeprecated-declarations]
  gtk_status_icon_set_from_icon_name(status, ICON);
  ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:261:0,
                 from ui_status.h:23,
                 from ui_status.c:20:
/usr/include/gtk-3.0/gtk/deprecated/gtkstatusicon.h:106:23: note: declared here
 void gtk_status_icon_set_from_icon_name (GtkStatusIcon *status_icon,
                       ^
ui_status.c: In function ‘is_status_supported’:
ui_status.c:67:2: warning: ‘gtk_status_icon_is_embedded’ is deprecated [-Wdeprecated-declarations]
  return status && gtk_status_icon_is_embedded(status);
  ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:261:0,
                 from ui_status.h:23,
                 from ui_status.c:20:
/usr/include/gtk-3.0/gtk/deprecated/gtkstatusicon.h:157:23: note: declared here
 gboolean gtk_status_icon_is_embedded (GtkStatusIcon *status_icon);
                       ^
ui_status.c: In function ‘ui_status_update’:
ui_status.c:85:3: warning: ‘gtk_status_icon_set_from_icon_name’ is deprecated [-Wdeprecated-declarations]
   gtk_status_icon_set_from_icon_name(status, ICON);
   ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:261:0,
                 from ui_status.h:23,
                 from ui_status.c:20:
/usr/include/gtk-3.0/gtk/deprecated/gtkstatusicon.h:106:23: note: declared here
 void gtk_status_icon_set_from_icon_name (GtkStatusIcon *status_icon,
                       ^
ui_status.c:87:3: warning: ‘gtk_status_icon_set_from_icon_name’ is deprecated [-Wdeprecated-declarations]
   gtk_status_icon_set_from_icon_name(status, ATTENTION_ICON);
   ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:261:0,
                 from ui_status.h:23,
                 from ui_status.c:20:
/usr/include/gtk-3.0/gtk/deprecated/gtkstatusicon.h:106:23: note: declared here
 void gtk_status_icon_set_from_icon_name (GtkStatusIcon *status_icon,
                       ^
ui_status.c: In function ‘ui_status_set_visible’:
ui_status.c:106:4: warning: ‘gtk_status_icon_set_visible’ is deprecated [-Wdeprecated-declarations]
    gtk_status_icon_set_visible(status, TRUE);
    ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:261:0,
                 from ui_status.h:23,
                 from ui_status.c:20:
/usr/include/gtk-3.0/gtk/deprecated/gtkstatusicon.h:151:23: note: declared here
 void gtk_status_icon_set_visible (GtkStatusIcon *status_icon,
                       ^
ui_status.c:108:4: warning: ‘gtk_status_icon_set_visible’ is deprecated [-Wdeprecated-declarations]
    gtk_status_icon_set_visible(status, FALSE);
    ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:261:0,
                 from ui_status.h:23,
                 from ui_status.c:20:
/usr/include/gtk-3.0/gtk/deprecated/gtkstatusicon.h:151:23: note: declared here
 void gtk_status_icon_set_visible (GtkStatusIcon *status_icon,
                       ^