You could try requesting that in the Debian backports mailing list: https://lists.debian.org/debian-backports/
Or attempt it yourself: https://wiki.debian.org/SimpleBackportCreation
Though my daily driver is Jessie-based MX Linux, I've recently learned how to set up and use various generic Debian QEMU pbuilder machines on this, so I can throw the testing sources into the maw of a Stretch build environment and see what comes out the other end in var/cache/pbuilder. Let me see if it is a simple backport.
Edit: No problem with a simple backport of 64-bit packages, so a simple backport per the wiki procedure should also work for you.
If you can't install libmicrohttp-dev on your system, something is wrong with your software sources--the normal list is in /etc/apt/sources.list. Can you try installing inxi and giving the output of
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inxi -r
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cat /etc/apt/sources.list