chore(NA): remove last mentions to the DLL machinery

src/dev/build/README.md

@@ -39,14 +39,3 @@ The majority of this logic is extracted from the grunt build that has existed fo
 [lib/build.js]: ./lib/build.js
 [build_distributables.js]: ./build_distributables.js
 [../tooling_log/tooling_log.js]: ../tooling_log/tooling_log.js
-
-# Client Node Modules Cleaning
-
-We have introduced in our bundle a webpack dll for the client vendor modules in order to improve
-the optimization time both in dev and in production. As for those modules we already have the 
-code into the vendors_${chunk_number}.bundle.dll.js we have decided to delete those bundled modules from the 
-distributable node_modules folder. However, in order to accomplish this, we need to exclude 
-every node_module used in the server side code. This logic is performed 
-under `nodejs_modules/clean_client_modules_on_dll_task.js`. In case we need to add any new cli
-or any other piece of server code other than `x-pack` or `core_plugins` we'll need
-to update the globs present on `clean_client_modules_on_dll_task.js` accordingly.

src/dev/build/tasks/optimize_task.js

@@ -41,7 +41,6 @@ export const OptimizeBuildTask = {
     await exec(log, kibanaScript, kibanaArgs, {
       cwd: build.resolvePath('.'),
       env: {
-        FORCE_DLL_CREATION: 'true',
         KBN_CACHE_LOADER_WRITABLE: 'true',
         NODE_OPTIONS: '--max-old-space-size=4096',
       },