Specify module name via moduleName option instead of freeCompilerArgs

This allows to get rid of warnings about duplicate module name in some
of the modules.

libraries/kotlin.test/testng/build.gradle

@@ -34,7 +34,8 @@ configureSourcesJar()
 configureJavadocJar()
 
 compileKotlin {
-    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package", "-module-name", project.name]
+    kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package"]
+    kotlinOptions.moduleName = project.name
 }
 
 compileTestKotlin {