message: Bump node-gyp-build and prebuildify
  And unlock napi-macros.
diff: },
  "dependencies": {
  "abstract-leveldown": "~6.2.2",
  - "napi-macros": "~2.0.0",
  - "node-gyp-build": "~4.1.0"
  + "napi-macros": "^2.0.0",
  + "node-gyp-build": "^4.2.3"
  },
  "devDependencies": {
  "async-each": "^1.0.3",
  "mkfiletree": "^2.0.0",
  "node-gyp": "^6.0.0",
  "nyc": "^15.0.0",
  - "prebuildify": "^3.0.0",
  + "prebuildify": "^4.1.1",
  "prebuildify-ci": "^1.0.4",
  "prebuildify-cross": "^4.0.0",
  "readfiletree": "^1.0.0",
  