gobex: Fix build on 32 bits systems

gobex: Fix build on 32 bits systems

GUINT_TO_POINTER does not cast properly in older version of GLib (< 2.31)
causing the following errors:

cc1: warnings being treated as errors
gobex/gobex-apparam.c: In function ‘g_obex_apparam_set_bytes’:
gobex/gobex-apparam.c:176:38: error: cast to pointer from integer of
different size
gobex/gobex-apparam.c: In function ‘g_obex_apparam_get_uint8’:
gobex/gobex-apparam.c:243:43: error: cast to pointer from integer of
different size
gobex/gobex-apparam.c: In function ‘g_obex_apparam_get_uint16’:
gobex/gobex-apparam.c:261:43: error: cast to pointer from integer of
different size
gobex/gobex-apparam.c: In function ‘g_obex_apparam_get_uint32’:
gobex/gobex-apparam.c:282:43: error: cast to pointer from integer of
different size
gobex/gobex-apparam.c: In function ‘g_obex_apparam_get_uint64’:
gobex/gobex-apparam.c:303:43: error: cast to pointer from integer of
different size
gobex/gobex-apparam.c: In function ‘g_obex_apparam_get_string’:
gobex/gobex-apparam.c:324:43: error: cast to pointer from integer of
different size
gobex/gobex-apparam.c: In function ‘g_obex_apparam_get_bytes’:
gobex/gobex-apparam.c:342:43: error: cast to pointer from integer of
different size
make[1]: *** [gobex/gobex-apparam.o] Error 1
make: *** [all] Error 2