Bug#888705: abseil-cpp packaging

[Benjamin Barenblat <bbaren@debian.org>]

I’m getting very close to an Abseil upload. The CMake integration
doesn’t work yet, but I can install the binary packages and build
software that links Abseil.

I’m going to keep working on CMake support, but I’d love to upload what
I have to Salsa. Would somebody be willing to reset the
https://salsa.debian.org/debian/abseil repository to a pristine state so
I can push to it without any of the old history in that repo? I’d do it
myself, but Google has some weird rules about creating new repositories;
it would be much easier for me if someone else could create the repo and
give me push access.