Port recent dbusbind.c changes to 32-bit --with-wide-int.

Port recent dbusbind.c changes to 32-bit --with-wide-int.

* dbusbind.c (xd_append_arg, xd_retrieve_arg, Fdbus_message_internal):
Remove unportable assumptions about print widths of types like
dbus_uint32_t.
(xd_get_connection_address, Fdbus_init_bus): Cast Emacs integer to
intptr_t when converting between pointer and integer, to avoid GCC
warnings about wrong width.