[gnutls-devel] GnuTLS | Do not send extensions length field if there are no extensions (!867)

[Development of GNU's TLS library]

New Merge Request !867

https://gitlab.com/gnutls/gnutls/merge_requests/867

Project:Branches: dwmw2/gnutls:emptyext to gnutls/gnutls:master
Author:    David Woodhouse
Assignee:  


Since GnuTLS 3.6.3 we have started sending a zero-length list of extensions in ServerHello when there are none, instead of omitting the list entirely. This upsets the Cisco AnyConnect client as discussed in https://gitlab.com/openconnect/ocserv/merge_requests/92

## Checklist
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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