libgit2: Fix build

[marcellomaugeri]

Commit fb59acb24652383baf46744892058a044d12724f (libgit2) introduced the USE_AUTH_NTLM flag, which causes a dependency not to be built.

[github-actions]

marcellomaugeri is a new contributor to projects/libgit2. The PR must be approved by known contributors before it can be merged. The past contributors are: fanquake, DonggeLiu, devtty1er, Dor1s, nelhage (unverified), pks-t (unverified)

[marcellomaugeri]

The builds work on my machine, but I suspect the build failures are due to an architecture mismatch (I use an ARM Mac, and I could see that some of the build images are defaulting to ARM).
I will update here as soon as I fix the builds. Do not release the workflows for now, thanks.

[marcellomaugeri]

Now the build works, except for the (none, address, x86_64) as it is looking for $LIB_FUZZING_ENGINE which is missing. I could not run the fuzzer though, it gives a memory allocation error (probably due to the emulation? I have to try in a native amd64 machine), I will investigate more next week.