Both of those packages provide the hostapd and wpa-supplicant capabilities (see opkg whatprovides hostapd for example), but since neither of those is a default package and neither is mentioned anywhere in the packages lists reported by the rpc-sys packagelist call, there's no way for owut to know how to associate them.
This is an issue with packaging, but there's nothing owut can do about it, you'd need to dig into the target and package Makefiles, and see if you could resolve it there.