Use Void instead of Unit in RMI calls, should fix EA-82064

("Could not initialize class Kotlin.Unit")

(cherry picked from commit b3a1311)

compiler/daemon/daemon-client/src/org/jetbrains/kotlin/daemon/client/CompilerCallbackServicesFacadeServer.kt

@@ -80,9 +80,10 @@ open class CompilerCallbackServicesFacadeServer(
 
     override fun lookupTracker_isDoNothing(): Boolean = lookupTracker_isDoNothing
 
-    override fun compilationCanceledStatus_checkCanceled() {
+    override fun compilationCanceledStatus_checkCanceled(): Void? {
         try {
             compilationCanceledStatus!!.checkCanceled()
+            return null
         }
         catch (e: Exception) {
             // avoid passing exceptions that may have different serialVersionUID on across rmi border

compiler/daemon/daemon-common/src/org/jetbrains/kotlin/daemon/common/CompilerCallbackServicesFacade.kt

@@ -81,7 +81,7 @@ interface CompilerCallbackServicesFacade : Remote {
     // ----------------------------------------------------
     // CompilationCanceledStatus
     @Throws(RemoteException::class, RmiFriendlyCompilationCanceledException::class)
-    fun compilationCanceledStatus_checkCanceled(): Unit
+    fun compilationCanceledStatus_checkCanceled(): Void?
 }