Merge branch 'jc/undash-in-tree-git-callers'

A handful of places in in-tree code still relied on being able to execute the git subcommands, especially built-ins, in "git-foo" form, which have been corrected. * jc/undash-in-tree-git-callers: credential-cache: use child_process.args cvsexportcommit: do not run git programs in dashed form transport-helper: do not run git-remote-ext etc. in dashed form