* dbus/dbus-arch-deps.h.in: add 16/32-bit types

	* configure.in: find the right type for 16 and 32 bit ints as well
	as 64

	* dbus/dbus-protocol.h (DBUS_TYPE_INT16, DBUS_TYPE_UINT16): add
	the 16-bit types so people don't have to stuff them in 32-bit or
	byte arrays.