Remove 'require' test as bufferutil now ships prebuilt

package.json

@@ -73,14 +73,13 @@
     "tar": "^2.2.1"
   },
   "devDependencies": {
-    "async": "^2.3.0",
-    "bufferutil": "^3.0.0",
+    "async": "^2.4.0",
     "cc": "^1.0.0",
     "documentation": "^4.0.0-rc.0",
     "exif-reader": "^1.0.2",
     "icc": "^1.0.0",
     "mocha": "^3.3.0",
-    "nyc": "^10.2.2",
+    "nyc": "^10.3.2",
     "rimraf": "^2.5.4",
     "semistandard": "^11.0.0",
     "unzip": "^0.1.11"

test/unit/require.js

@@ -1,15 +0,0 @@
-'use strict';
-
-/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "(bufferutil|sharp)" }] */
-
-describe('Require-time checks', function () {
-  /**
-    Including sharp alongside another C++ module that does not require
-    -stdlib=libc++ (for its C++11 features) has caused clang/llvm to
-    segfault due to the use of static function variables.
-  */
-  it('Require alongside C++ module that does not use libc++', function () {
-    const bufferutil = require('bufferutil');
-    const sharp = require('../../');
-  });
-});