New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/23520#discussion_r453203759

Comment:
It only seems to be used in `build.rs`, so I figured it would be ok. Otherwise it tries to build `libgit2` just to include commit information into the program, which doesn't even exist in the tarball. I will see if I can move to a more up to date version of `libgit2-sys`. If that doesn't work, should I include `cmake` as a build time dep and let it build `libgit2`?