Dont update global npm

Author: durran

.evergreen.yml

@@ -71,7 +71,7 @@ functions:
         # Load environment variables generated by `configure`
         . ~/compass_env.sh
         echo "//registry.npmjs.org/:_authToken=${compass_npm_token}" >> .npmrc
-        npm install -g npm node-gyp yarn
+        npm install -g node-gyp yarn
 
         # Trying to get rid of scandir npm errors.
         npm cache clean --force