Move away from deprecated gulp-util

build/package.json

@@ -2,9 +2,11 @@
   "name": "code-oss-dev-build",
   "version": "1.0.0",
   "devDependencies": {
+    "@types/ansi-colors": "^3.2.0",
     "@types/azure": "0.9.19",
     "@types/debounce": "^1.0.0",
     "@types/documentdb": "1.10.2",
+    "@types/fancy-log": "^1.3.0",
     "@types/glob": "^7.1.1",
     "@types/gulp": "^4.0.5",
     "@types/gulp-concat": "^0.0.32",
@@ -13,7 +15,6 @@
     "@types/gulp-rename": "^0.0.33",
     "@types/gulp-sourcemaps": "^0.0.32",
     "@types/gulp-uglify": "^3.0.5",
-    "@types/gulp-util": "^3.0.34",
     "@types/mime": "0.0.29",
     "@types/minimatch": "^3.0.3",
     "@types/minimist": "^1.2.0",