Turns out this does not work if we are injecting, since ffxiv_dx11.exe does not have dalamud workdir in its DLL search path and can't link the nethost DLL. I definitely don't want to modify the search path in ffxiv_dx11.exe so this bodge will do for now.
* CoreCLR: resolve and load nethost on demand instead of requiring it on load
* Remove nethost loading from C# side
* Added option to not chain Process.Dispose; see for last error only if result is empty