headers: Add various missing G_DISABLE_DEPRECATED guards

As pointed out by gtk-doc, these are all symbols which have been marked
as deprecated, but which aren’t protected by a deprecation guard. We
can’t use G_DEPRECATED_IN_* for them, as they are all non-function
symbols. Instead, wrap them in #ifndef G_DISABLE_DEPRECATED.

In some cases, we also need to wrap one or two functions which use the
deprecated types in G_DISABLE_DEPRECATED too.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

gobject/gparam.h

@@ -260,6 +260,8 @@ struct _GParamSpecClass
   /*< private >*/
   gpointer	  dummy[4];
 };
+
+#ifndef G_DISABLE_DEPRECATED
 /**
  * GParameter:
  * @name: the parameter name
@@ -275,7 +277,7 @@ struct _GParameter /* auxiliary structure for _setv() variants */
   const gchar *name;
   GValue       value;
 };
-
+#endif  /* !G_DISABLE_DEPRECATED */
 
 /* --- prototypes --- */
 GLIB_AVAILABLE_IN_ALL