Log Kotlin compiler classpath with File.pathSeparator in Gradle

To make it easier to copy-paste it to run the compiler outside of
Gradle.

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/compilerRunner/GradleKotlinCompilerWork.kt

@@ -151,8 +151,10 @@ internal class GradleKotlinCompilerWork @Inject constructor(
 
     private fun compileWithDaemonOrFallbackImpl(messageCollector: MessageCollector): Pair<ExitCode, KotlinCompilerExecutionStrategy> {
         with(log) {
-            kotlinDebug { "Kotlin compiler class: ${compilerClassName}" }
-            kotlinDebug { "Kotlin compiler classpath: ${compilerFullClasspath.joinToString { it.normalize().absolutePath }}" }
+            kotlinDebug { "Kotlin compiler class: $compilerClassName" }
+            kotlinDebug {
+                "Kotlin compiler classpath: ${compilerFullClasspath.joinToString(File.pathSeparator) { it.normalize().absolutePath }}"
+            }
             kotlinDebug { "$taskPath Kotlin compiler args: ${compilerArgs.joinToString(" ")}" }
         }