ikvmstub fails to find the hotrodcs.dll assembly

On some machine this error appears in the log:

(CustomBuild target) ->
CUSTOMBUILD : error : unable to find assembly 'hotrodcs, Version=7.0.0.0, Culture=neutral, PublicKeyToken=69589c118f6ffa4b' [E:\dc\dotnet-client\build_windows\hotrod-ikvm-jar.vcxproj]

The message is not very explicit. Tracked it down to the step which generates the ikvmstubs for the hotrodcs-tests.dll (https://github.com/infinispan/dotnet-client/blob/master/CMakeLists.txt#L237).

ikvmstub.exe is executed in java_tests/ and the .dll is in the root of the build dir. Need to add the root dir to the path where assemblies should be looked-up.