[rtmpdump] gnutls support rtmpdump

[Harald Glanzer]

hi there,

* i found that after switching to gnutls (i guess openssl 1.1.1 support
will not be implemented) there is a problem with b64enc(), namely no string
delimiter is written, and therefore the challenge is wrong.
i prepared a patch which i can push if wanted.

* also, i wanted to ask which gnutls version is supposed to be supported
for librtmp. both with gnutls 3.6.4 and 3.6.7 (latest) i cannot start rtmp
over tls connections, as TLS_Connect() fails.

on the wire, i can see:
- client hello
- server hello + application data
- client: change cipher spec + application data
... and then client does a TCP RST. any ideas?

maybe the TLS initialisation must be reworked inside librtmp?

regards,
hari
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