Replace all occurrences of WITH_RUNTIME with WITH_STDLIB

We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.

compiler/testData/codegen/box/sam/constructors/comparator.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 // SKIP_DCE_DRIVEN
 
 fun box(): String {

compiler/testData/codegen/box/sam/constructors/kt19251.kt

@@ -1,6 +1,6 @@
 // SKIP_JDK6
 // TARGET_BACKEND: JVM
-// WITH_RUNTIME
+// WITH_STDLIB
 // FULL_JDK
 // FILE: test.kt
 fun box(): String {

compiler/testData/codegen/box/sam/constructors/kt19251_child.kt

@@ -1,6 +1,6 @@
 // SKIP_JDK6
 // TARGET_BACKEND: JVM
-// WITH_RUNTIME
+// WITH_STDLIB
 // FULL_JDK
 // FILE: test.kt
 fun box(): String {

compiler/testData/codegen/box/sam/constructors/nonLiteralComparator.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 // SKIP_DCE_DRIVEN
 
 fun box(): String {

compiler/testData/codegen/box/sam/constructors/samWrappersDifferentFiles.kt

@@ -1,6 +1,6 @@
 // TARGET_BACKEND: JVM
 
-// WITH_RUNTIME
+// WITH_STDLIB
 // FILE: 1/wrapped.kt
 
 fun getWrapped1(): Runnable {