Header files for WebRTC iOS, etc

Hi,

why are there header files for iOS, Linux, Mac, etc. for WebRTC under UE_4.25\Engine\Source\ThirdParty\WebRTC\rev.24472\Include when there is only a lib for Win64?

Is it possible to use WebRTC under multiple platforms (Android, iOS, Windows) or only on windows? And how would you access these headers? In the project solution, there are only some .tps files and a build.cs in the Thirdparty/WebRTC folder.

Regards

UE4.25 && UE4.26 Git version
UE4.25.4\Engine\Source\ThirdParty\WebRTC\rev.24472\Include\iOS|Linux|Mac|Win32|Win64
UE4.25.4\Engine\Source\ThirdParty\WebRTC\rev.24472\LibiOS|Linux|Mac|Win32|Win64