Compensate for different versions of folly for open source build

Summary: ReactAndroid will need to use the deprecated version of folly::dynamic for the time being.

Reviewed By: bestander

Differential Revision: D3025433

fb-gh-sync-id: fee6beb65d5d0c449f1a08a0d3c593b788905001
shipit-source-id: fee6beb65d5d0c449f1a08a0d3c593b788905001

ReactAndroid/src/main/jni/react/jni/BUCK

@@ -69,6 +69,7 @@ jni_library(
   compiler_flags = [
     '-Wall',
     '-Werror',
+    '-Wno-deprecated-declarations',
     '-fexceptions',
     '-std=c++11',
     '-fvisibility=hidden',

ReactAndroid/src/main/jni/react/jni/OnLoad.cpp

@@ -233,7 +233,7 @@ struct WritableNativeArray
   static constexpr const char* kJavaDescriptor = "Lcom/facebook/react/bridge/WritableNativeArray;";
 
   WritableNativeArray()
-      : HybridBase(folly::dynamic::array) {}
+      : HybridBase(folly::dynamic({})) {}
 
   static local_ref<jhybriddata> initHybrid(alias_ref<jclass>) {
     return makeCxxInstance();