Wyatt OʼDay reported in #7385 that mbedTLS isn't backwards compatible
and curl no longer builds with it. Document the need to fix our support
until so has been done.
Closes #7390
Fixes #7385
Reported-by: Wyatt OʼDay
Reviewed-by: Jay Satiro <raysatiro@yahoo.com>
13.11 Support intermediate & root pinning for PINNEDPUBLICKEY
13.13 Make sure we forbid TLS 1.3 post-handshake authentication
13.14 Support the clienthello extension
+ 13.15 Support mbedTLS 3.0
14. GnuTLS
14.2 check connection
https://tools.ietf.org/html/rfc7685
https://github.com/curl/curl/issues/2299
+13.15 Support mbedTLS 3.0
+
+ Version 3.0 is not backwards compatible with pre-3.0 versions, and curl no
+ longer builds due to breaking changes in the API.
+
+ See https://github.com/curl/curl/issues/7385
+
14. GnuTLS
14.2 check connection