It doesn't exist this functionality OOTB.
One option is to get from github the source code of Field Suite and to update to Sitecore 8.2 (https://github.com/Velir/SitecoreFieldSuite/tree/master )
Is not an easy task because on Sitecore 8 was introduced Speak.
Other option is to implement something with same functionality in this way:
You have a template named Link that contains a field of type GeneralLink. You create items of type Link under a folder "Site Links".
On the items where do you want to have External/Internal Links you will have a MultiList field with a Datasource witch point to Site Links folder item;
Is not the most elegant way but if you educate editors they can leave with it. And if you upgrade in the future you will not have any problems because is OOTB functionality.