Track use of extensions to avoid duplicate extensions in the same message#114

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gbryant-arm wants to merge 3 commits intohannestschofenig:tls13-prototypefrom gbryant-arm:extension-tracking

+252-66

Commits on Jan 8, 2021

Introduce helper function to keep track of present extensions and avoid writing
gbryant-arm
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Enforce the unicity of extension types in ClientHello, HelloRetryRequest,
gbryant-arm
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Commits on Jan 14, 2021

Update mbedtls_ssl_extensions_present() to support detection of a conjunction
gbryant-arm
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