Add missing files

libs/fbjni/src/main/cpp/include/fb/visibility.h

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#define FBEXPORT __attribute__((visibility("default")))