make vita content package target build

Minecraft.Client/PSVita/Leaderboards/PSVitaLeaderboardManager.cpp

@@ -55,7 +55,10 @@ HRESULT PSVitaLeaderboardManager::destroyTransactionContext(int transactionConte
 
 HRESULT PSVitaLeaderboardManager::getFriendsList(sce::Toolkit::NP::Utilities::Future<sce::Toolkit::NP::FriendsList> &friendsList)
 {
-	return sce::Toolkit::NP::Friends::Interface::getFriendslist(&friendsList, false);
+	// Stubbed: the vendored libSceNpToolkit_rtti.a only exports getFriendslist() for
+	// Future<vector<Friend>>, but this SDK's headers declare FriendsList as vector<NpUser>,
+	// so the real call is an undefined symbol at link time. Fail gracefully until the lib is updated.
+	return -1;
 }
 
 char *PSVitaLeaderboardManager::getComment(SceNpScoreComment *comment)