fix: revert BUILD_FROM_SOURCE in Package.swift

Author: cipolleschi

packages/react-native/Package.swift

@@ -9,7 +9,7 @@
 import PackageDescription
 import Foundation
 
-let BUILD_FROM_SOURCE = true
+let BUILD_FROM_SOURCE = false
 
 /**
  This is the `Package.swift` file that allows to build React Native core using Swift PM.