[datapipe] Remove dead code. JB#22475

Remove unused macros:
- datapipe_get_gsize()
- datapipe_get_gbool()
- datapipe_get_gpointer()

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

datapipe.h

@@ -144,21 +144,12 @@ void           mce_datapipe_quit            (void);
  * Macros
  * ========================================================================= */
 
-/** Retrieve a gboolean from a datapipe */
-# define datapipe_get_gbool(_datapipe)  (GPOINTER_TO_INT((_datapipe).dp_cached_data))
-
 /** Retrieve a gint from a datapipe */
 # define datapipe_get_gint(_datapipe)   (GPOINTER_TO_INT((_datapipe).dp_cached_data))
 
 /** Retrieve a guint from a datapipe */
 # define datapipe_get_guint(_datapipe)  (GPOINTER_TO_UINT((_datapipe).dp_cached_data))
 
-/** Retrieve a gsize from a datapipe */
-# define datapipe_get_gsize(_datapipe)  (GPOINTER_TO_SIZE((_datapipe).dp_cached_data))
-
-/** Retrieve a gpointer from a datapipe */
-# define datapipe_get_gpointer(_datapipe)       ((_datapipe).dp_cached_data)
-
 /* Helper for making display state requests
  *
  * This needs to be macro so that logging context stays