stick to prepare to avoid re-running yarn for addons everytime during build

package.json

@@ -16,9 +16,10 @@
     "posttest": "npm run lint",
     "test-api": "mocha \"**/*.api.js\"",
     "test-unit": "node ./bin/test.js",
-    "prebuild": "node ./bin/install-addons.js",
     "build": "tsc -b ./tsconfig.all.json",
-    "prepare": "npm run build",
+    "prepare": "npm run setup",
+    "setup": "npm run build",
+    "presetup": "node ./bin/install-addons.js",
     "prepublishOnly": "npm run package",
     "watch": "tsc -b -w ./tsconfig.all.json --preserveWatchOutput",
     "benchmark": "NODE_PATH=./out xterm-benchmark -r 5 -c test/benchmark/benchmark.json",