Exclude some build files from native modules

In practice this removes about 1MB of extraneous build resoures from the
spellchecker module in a packaged build.

// FREEBIE

package.json

@@ -96,6 +96,8 @@
       "node_modules/**",
       "!**/node_modules/*/{CHANGELOG.md,README.md,README,readme.md,readme,test,__tests__,tests,powered-test,example,examples,*.d.ts}",
       "!**/node_modules/.bin",
+      "!**/node_modules/*/build/**",
+      "**/node_modules/*/build/**/*.node",
       "!**/*.{o,hprof,orig,pyc,pyo,rbc}",
       "!**/._*",
       "!**/{.DS_Store,.git,.hg,.svn,CVS,RCS,SCCS,__pycache__,thumbs.db,.gitignore,.gitattributes,.editorconfig,.flowconfig,.yarn-metadata.json,.idea,appveyor.yml,.travis.yml,circle.yml,npm-debug.log,.nyc_output,yarn.lock,.yarn-integrity}"