fix: Allow building React Native from source

[tido64]

Test Plan

1. Apply the patch below (6f99beff7e was good last I checked)
2. Run the usual install commands (i.e. yarn, pod install, etc.)
3. Build the JS bundle, i.e. yarn build:android and yarn build:ios
4. Build the app in Android Studio or Xcode

diff --git a/example/package.json b/example/package.json
index e16f729..f6aa424 100644
--- a/example/package.json
+++ b/example/package.json
@@ -16,10 +16,12 @@
   },
   "devDependencies": {
     "@babel/core": "^7.0.0",
+    "@react-native-community/cli": "^4.10.0",
+    "@react-native-community/cli-platform-android": "^4.10.0",
+    "@react-native-community/cli-platform-ios": "^4.10.0",
     "mkdirp": "^0.5.1",
-    "react": "16.9.0",
-    "react-native": "0.61.5",
-    "react-native-macos": "0.61.39",
+    "react": "16.13.1",
+    "react-native": "facebook/react-native#master",
     "react-native-test-app": "../"
   }
 }

[sweggersen]

Well done solution for Android 👏 LGTM

[tido64]

🎉 This PR is included in version 0.1.15 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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