Fixes compile issue with ue5-main

[rweber89]

Fixes #17

[mastercoms]

This change is also in the 5.0 branch, I guess this PR does enhance support in one case though.

[rweber89]

It keeps compatibility with the non-source released EA build which is on version 5.0.
A source build that's not on 5.1, but also on 5.0 and has this breaking change, there isn't much more to be done unfortunately.

[mastercoms]

Yep :)