Use my patched verson of git2-rs

Now, the Vagrant VM uses my patched version of git2-rs, which has a modified build.rs file in libgit2-sys, which blocks libhttp_parser from being linked. As you can see by the comment, I’m not a fan of the fix, but at least it works, right?

See #194, and also #255.

Vagrantfile

@@ -95,6 +95,25 @@ Vagrant.configure(2) do |config|
     EOF
     
     
+    # Download my patched version of git2-rs.
+    # This is basically a hack and we should get rid of it as soon as
+    # a better solution comes along.
+    # See https://github.com/ogham/exa/issues/194
+    config.vm.provision :shell, privileged: false, inline: <<-EOF
+        set -xe
+        git clone https://github.com/ogham/git2-rs.git /home/ubuntu/git2-rs
+        mkdir -p /home/ubuntu/.cargo
+        echo 'paths = ["/home/ubuntu/git2-rs/libgit2-sys"]' > /home/ubuntu/.cargo/config
+    EOF
+    
+    # This fix is applied by changing the VM rather than changing the
+    # Cargo.toml file so it works for everyone because it’s such a niche
+    # build issue, it’s not worth specifying a non-crates.io dependency
+    # and losing the ability to `cargo publish` the exa crate there!
+    # It also isolates the hackiness to the one place I can test it
+    # actually works.
+
+
     # Write some welcoming text.
     config.vm.provision :shell, privileged: true, inline: <<-EOF
         rm -f /etc/update-motd.d/*