Windows -> Linux cross compile fails (lld is not built with zlib support)

[csciguy8]

Came up on the forum here.

CesiumForUnreal/Intermediate/Build/Linux/x64/UnrealGame/Shipping/CesiumRuntime/Module.CesiumRuntime.1.cpp.o:(.debug_loc) is compressed with ELFCOMPRESS_ZLIB, but lld is not built with zlib support

Most likely was caused by this PR, that reduced our .o size for shipping.

There are some things we could do:

• Recommend to try with Unreal Engine 5.4. The cross compile toolchain might be fixed. One caveat, will have to wait for UE 5.4 support in cesium-unreal (coming soon)
• Try to fix the cross-compile toolchain in UE 5.3.
• Revert the mentioned PR

Also, could be nice to have a workflow on CI that tested this for us, so we know it's always working.

[kring]

It's worth trying to reproduce this one ourselves. I'm surprised the cross-compiling lld shipped by Epic doesn't have zlib support, and even more surprised that we didn't notice this already if it doesn't. Makes me wonder if something else is going on.