SI-9915 Fix test on windows
SI-9915 Fix test on windows

Use `javac: -encoding UTF-8` tool args comment
so javac uses correct source encoding.

lrytz/scala,felixmulder/scala,lrytz/scala,martijnhoekstra/scala,felixmulder/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,shimib/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,jvican/scala,jvican/scala,martijnhoekstra/scala,shimib/scala,shimib/scala,scala/scala,martijnhoekstra/scala,jvican/scala,lrytz/scala,scala/scala,felixmulder/scala,scala/scala,felixmulder/scala,jvican/scala,jvican/scala,shimib/scala,felixmulder/scala,shimib/scala,felixmulder/scala,felixmulder/scala,jvican/scala,shimib/scala,martijnhoekstra/scala,lrytz/scala,jvican/scala,scala/scala