Remove aliases for runtime modules

Author: cknitt

src/RescriptCore.mjs

@@ -82,12 +82,6 @@ var $$BigUint64Array;
 
 var $$Intl;
 
-var MapperRt;
-
-var Internal;
-
-var Re;
-
 var Exn;
 
 var $$Option;
@@ -139,9 +133,6 @@ export {
   $$BigInt64Array ,
   $$BigUint64Array ,
   $$Intl ,
-  MapperRt ,
-  Internal ,
-  Re ,
   Exn ,
   $$Option ,
   List ,

src/RescriptCore.res

@@ -94,9 +94,6 @@ async function main() {
 */
 external import: 'a => promise<'a> = "#import"
 
-module MapperRt = Js.MapperRt
-module Internal = Js.Internal
-module Re = Core__RegExp // needed for the %re sugar
 module Exn = Js.Exn
 module Option = Core__Option
 module List = Core__List