Workarounds to build parts of stdlib as kotlin-runtime and mock runtime

Fix source paths of kotlin-stdlib-minimal-for-tests

libraries/stdlib/jvm-minimal-for-test/build.gradle.kts

@@ -23,16 +23,19 @@ sourceSets {
 }
 
 val copySources by task<Copy> {
-    from(project(":kotlin-stdlib").projectDir.resolve("jvm/runtime"))
-            .include("kotlin/TypeAliases.kt",
-                    "kotlin/text/TypeAliases.kt")
-    from(project(":kotlin-stdlib").projectDir.resolve("src"))
-            .include("kotlin/collections/TypeAliases.kt",
-                    "kotlin/jvm/JvmVersion.kt",
-                    "kotlin/util/Standard.kt",
-                    "kotlin/internal/Annotations.kt",
-                    "kotlin/internal/contracts/ContractBuilder.kt",
-                    "kotlin/internal/contracts/Effect.kt")
+    val stdlibProjectDir = project(":kotlin-stdlib").projectDir
+
+    from(stdlibProjectDir.resolve("runtime"))
+        .include("kotlin/TypeAliases.kt",
+                 "kotlin/text/TypeAliases.kt")
+    from(stdlibProjectDir.resolve("src"))
+        .include("kotlin/collections/TypeAliases.kt",
+                 "kotlin/jvm/JvmVersion.kt")
+    from(stdlibProjectDir.resolve("../src"))
+        .include("kotlin/util/Standard.kt",
+                 "kotlin/internal/Annotations.kt",
+                 "kotlin/internal/contracts/ContractBuilder.kt",
+                 "kotlin/internal/contracts/Effect.kt")
     into(File(buildDir, "src"))
 }
 
@@ -44,7 +47,7 @@ tasks.withType<JavaCompile> {
 tasks.withType<KotlinCompile> {
     dependsOn(copySources)
     kotlinOptions {
-        freeCompilerArgs += listOf("-module-name", "kotlin-stdlib")
+        freeCompilerArgs += listOf("-module-name", "kotlin-stdlib", "-Xmulti-platform")
     }
 }