xtask doesn't build w/o openssl installed

[EverlastingBugstopper]

I'm trying to avoid installing brew on my machine for personal reasons, and openssl 1.1.1 seems to be fairly impossible to build and install from source and generally skeeves me out (sudo make install on a macbook feels... fraught).

Regardless, I would like rust-analyzer to work OK without needing too much extra configuration and so I would like to propose vendoring openssl in that workspace crate.

If you run this command, you'll see that it's being brought in by the git2 crate.

cargo metadata --format-version 1 | jq -c '.packages[] | select(.dependencies | any((.name == "openssl-sys"))) | .name'
"git2"
"libgit2-sys"
"libssh2-sys"

The git2 crate has a vendored-openssl feature, we should enable it.