Use more accurate license information for j2objc/protobuf

PiperOrigin-RevId: 659644583

Author: j2objc-copybara

protobuf/LICENSE

@@ -30,3 +30,233 @@ Code generated by the Protocol Buffer compiler is owned by the owner
 of the input file used when generating it.  This code is not
 standalone and requires a support library to be linked with it.  This
 support library is itself covered by the above license.
+
+---
+
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