compat: Add libtinyxml2 shim

Change-Id: I2bc7963086f7f5df453e135819ed8b28c4d6a0d5

Android.bp

@@ -332,3 +332,11 @@ cc_library {
     ],
     vendor_available: true,
 }
+
+cc_library_shared {
+    name: "libtinyxml2_shim",
+    srcs: ["libtinyxml2/XMLDocument.cpp"],
+    shared_libs: ["libtinyxml2"],
+    system_ext_specific: true,
+    vendor_available: true,
+}

libtinyxml2/XMLDocument.cpp

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2023 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <tinyxml2.h>
+#include <new>
+
+namespace tinyxml2 {
+
+extern "C" {
+void* _ZN8tinyxml211XMLDocumentC1Eb(XMLDocument* thisptr, bool processEntities) {
+    return new (thisptr) XMLDocument(processEntities);
+}
+
+XMLError _ZN8tinyxml211XMLDocument8SaveFileEPKc(XMLDocument* thisptr, const char* filename) {
+    return thisptr->SaveFile(filename);
+}
+}
+
+}  // namespace tinyxml2