Adapt to klib abi version no longer being a single int32

(cherry picked from commit 75b5a2f248caf8e1e9e919784fd017671023078d)

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/RTTIGenerator.kt

@@ -101,7 +101,10 @@ internal class RTTIGenerator(override val context: Context) : ContextUtils {
 
                     extendedInfo,
 
-                    Int32(KotlinAbiVersion.CURRENT.version),
+                    // TODO: it used to be a single int32 ABI version,
+                    // but klib abi version is not an int anymore.
+                    // So now this field is just reserved to preserve the layout.
+                    Int32(0),
 
                     Int32(size),
 

runtime/src/main/cpp/TypeInfo.h

@@ -103,8 +103,8 @@ struct TypeInfo {
     const TypeInfo* typeInfo_;
     // Extended RTTI, to retain cross-version debuggability, since ABI version 5 shall always be at the second position.
     const ExtendedTypeInfo* extendedInfo_;
-    // ABI version.
-    uint32_t abiVersion_;
+    // Unused field.
+    uint32_t unused_;
     // Negative value marks array class/string, and it is negated element size.
     int32_t instanceSize_;
     // Must be pointer to Any for array classes, and null for Any.