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

libraries/stdlib/jdk7/build.gradle

@@ -26,7 +26,7 @@ sourceSets {
     test {
         kotlin {
             srcDir 'test'
-            if(!System.properties.'idea.active') {
+            if(!BuildPropertiesKt.getKotlinBuildProperties(project).inIdeaSync) {
                 srcDir '../jvm/test'
                 srcDir '../common/test'
                 srcDir '../test'

libraries/stdlib/jdk8/build.gradle

@@ -28,7 +28,7 @@ sourceSets {
     test {
         kotlin {
             srcDir 'test'
-            if(!System.properties.'idea.active') {
+            if(!BuildPropertiesKt.getKotlinBuildProperties(project).inIdeaSync) {
                 srcDir '../jvm/test'
                 srcDir '../common/test'
                 srcDir '../test'

libraries/stdlib/js/build.gradle

@@ -51,7 +51,7 @@ sourceSets {
     }
 
     experimental {
-        if(!System.properties.'idea.active')
+        if(!BuildPropertiesKt.getKotlinBuildProperties(project).inIdeaSync)
         kotlin {
             srcDir experimentalSrcDir
         }

libraries/stdlib/jvm/build.gradle

@@ -38,7 +38,7 @@ sourceSets {
     }
     coroutinesExperimentalMigrationTest {
         kotlin {
-            if(!System.properties.'idea.active') {
+            if(!BuildPropertiesKt.getKotlinBuildProperties(project).inIdeaSync) {
                 srcDir '../coroutines-experimental/jvm/test'
             }
         }