Merge pull request #4841 from rescript-lang/remove_cmti

upgrade build engine which removes cmt/cmti

Author: bobzhang

darwin/ninja.exe

@@ -5,12 +5,6 @@ var path = require("path");
 var fs = require("fs");
 var assert = require("assert");
 var root = path.join(__dirname, "..");
-try {
-  // npmignore is broken let's do it
-  let file = path.join(root, process.platform, "bsc");
-  console.log(`try removing ${file}`);
-  fs.unlinkSync(file);
-} catch (e) {}
 
 var output = p.spawnSync(`npm pack --dry-run`, {
   cwd: root,