Build: implement useBootstrapStdlib flag

Excludes stdlib projects from build and uses bootstrap stdlib artifacts

 #KT-29205

libraries/tools/kotlin-script-util/build.gradle.kts

@@ -11,7 +11,7 @@ repositories {
 }
 
 dependencies {
-    compile(project(":kotlin-stdlib"))
+    compile(kotlinStdlib())
     compile(project(":kotlin-script-runtime"))
     compile(project(":kotlin-scripting-jvm"))
     compile(commonDep("org.jetbrains.intellij.deps", "trove4j"))