prepare for using system webpack

debian/patches/0420-use-system-libs.patch

@@ -0,0 +1,11 @@
+--- a/package.json
++++ b/package.json
+@@ -57,7 +57,7 @@
+     "vue-loader": "^11.3.4",
+     "vue-resource": "^0.9.3",
+     "vue-template-compiler": "^2.2.6",
+-    "webpack": "^2.3.3",
++//    "webpack": "^2.3.3",
+     "webpack-bundle-analyzer": "^2.3.0"
+   },
+   "devDependencies": {

debian/patches/add-system-lib-path-for-webpack.patch

@@ -0,0 +1,10 @@
+--- a/config/webpack.config.js
++++ b/config/webpack.config.js
+@@ -186,6 +186,7 @@
+ 
+   resolve: {
+     extensions: ['.js'],
++    modules: ['/usr/share/gitlab/node_modules', '/usr/lib/nodejs'],
+     alias: {
+       '~':              path.join(ROOT_PATH, 'app/assets/javascripts'),
+       'emojis':         path.join(ROOT_PATH, 'fixtures/emojis'),

debian/patches/series

@@ -15,3 +15,5 @@ pid-log-paths.patch
 0280-relax-pg.patch
 0400-use-npm-webpack.patch
 0410-set-webpack-root.patch
+0420-use-system-libs.patch
+add-system-lib-path-for-webpack.patch