[libmicrohttpd] Please add support for RFC7616 (Digest auth with sha-2 instead of md5)

[Tim Rühsen]

Hi,

curl just added support for RFC7616, and I just opened an issue for Wget2 as 
well.

Since wget2 uses MHD for it's test suite, support for that RFC in MHD would be 
great.

Basically, it's just sha-2 instead of md5 hashing, so should be straight 
forward.

WDYT ?

Regards, Tim

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