Add a fuzzer for libgit2 (#1604)

* Add a libgit2 fuzzer for the `git fetch` client

* Use a fresh remote each time

* Build fewer things, use fewer deps

* no ssh, either

* Add a corpus with one file.

Slightly tweaked network dump of a `git clone` on a tiny repo.

* auto_ccs is a list

* Rename the fuzzer

* only email in project.yaml

* Use `master`

I had left in a `-b oss-fuzz` from testing off my fork

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