Build maven-like stdlib sources artifacts during dist

This is needed to emulate gradle and maven like projects in plugin tests.

compiler/tests-common/tests/org/jetbrains/kotlin/codegen/forTestCompile/ForTestCompileRuntime.java

@@ -74,11 +74,21 @@ public class ForTestCompileRuntime {
         return assertExists(new File("dist/kotlinc/lib/kotlin-stdlib-sources.jar"));
     }
 
+    @NotNull
+    public static File stdlibMavenSourcesJarForTests() {
+        return assertExists(new File("dist/maven/kotlin-stdlib-sources.jar"));
+    }
+
     @NotNull
     public static File stdlibCommonForTests() {
         return assertExists(new File("dist/common/kotlin-stdlib-common.jar"));
     }
 
+    @NotNull
+    public static File stdlibCommonSourcesForTests() {
+        return assertExists(new File("dist/common/kotlin-stdlib-common-sources.jar"));
+    }
+
     @NotNull
     public static File stdlibJsForTests() {
         return assertExists(new File("dist/kotlinc/lib/kotlin-stdlib-js.jar"));