Build: support local.properties for JPS build. Apply JPS related tweaks only inside IDEA import.

libraries/kotlin.test/jvm/build.gradle

@@ -11,10 +11,10 @@ pill {
     importAsLibrary = true
 }
 
-def jpsBuild = findProperty("jpsBuild")?.toString() == "true"
+def includeJava9 = BuildPropertiesKt.getKotlinBuildProperties(project).includeJava9
 
 sourceSets {
-    if (!jpsBuild) {
+    if (includeJava9) {
         java9
     }
 }
@@ -40,7 +40,7 @@ task modularJar(type: Jar) {
     classifier = 'modular'
 
     from zipTree(jar.outputs.files.singleFile)
-    if (!jpsBuild) {
+    if (includeJava9) {
         from sourceSets.java9.output
     }
 }
@@ -66,6 +66,6 @@ compileTestKotlin {
     kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package"]
 }
 
-if (!jpsBuild) {
+if (includeJava9) {
     compileJava9Sources(project, 'kotlin.test')
 }