Revert "Build Tooling: Define build concurrency explicitly"

This reverts commit 4338f9e.

Author: aduth

.travis.yml

@@ -25,9 +25,7 @@ branches:
 before_install:
   - nvm install
 
-env:
-  - PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
-  - HARDWARE_CONCURRENCY=2
+env: PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
 
 jobs:
   include:

bin/packages/build.js

@@ -44,15 +44,7 @@ if ( ! files.length ) {
 	};
 }
 
-const options = {};
-if ( process.env.HARDWARE_CONCURRENCY ) {
-	// WorkerFarm is configured to use the number of CPUs available as the
-	// default value. This can be overwritten for finite control or for use in
-	// uncooperative continuous integration.
-	options.maxConcurrentWorkers = Number( process.env.HARDWARE_CONCURRENCY );
-}
-
-const worker = workerFarm( options, require.resolve( './build-worker' ) );
+const worker = workerFarm( require.resolve( './build-worker' ) );
 
 let complete = 0;