libgit2_config() reveals which version of libgit2 gert is using and which
features are supported, such whether you are able to use ssh remotes.
libgit2_config()
libgit2_config()#> $version #> [1] ‘1.1.0’ #> #> $ssh #> [1] TRUE #> #> $https #> [1] TRUE #> #> $threads #> [1] TRUE #> #> $config.global #> [1] "/data/home/anderson/.gitconfig" #> #> $config.system #> [1] "/etc/gitconfig" #> #> $config.home #> [1] "/data/home/anderson" #>