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* Add OpenSSL as supported licence type Adds special handling for the OpenSSL licensed files under BoringSSL. Specifically, some of the ARM assembly files in the latest Dart SDK are dual-licensed with OpenSSL. * Support blocks that ref by type with no copyright The upcoming Dart SDK includes files (e.g., sha256-armv4.S) with a block that specifies teh code is dual-licenced under OpenSSL, but doesn't include a copyright date of its own.