Copy fbjni library from react-native

lib/fb/onload.cpp

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#include <jni.h>
+#ifndef DISABLE_CPUCAP
+#include <fb/CpuCapabilities.h>
+#endif
+#include <fb/fbjni.h>
+
+using namespace facebook::jni;
+
+void initialize_xplatinit();
+void initialize_fbjni();
+
+JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+  return facebook::jni::initialize(vm, [] {
+    initialize_fbjni();
+#ifndef DISABLE_XPLAT
+    initialize_xplatinit();
+#endif
+#ifndef DISABLE_CPUCAP
+    initialize_cpucapabilities();
+#endif
+  });
+}