SourceControl: remove unnecessary shell usage (#5500)
SourceControl: remove unnecessary shell usage (#5500)

Rather than redirecting the file list from a file, pass the files on the
command line.  This avoids an unnecessary file write as well as a
subshell.  Furthermore, it makes the command more portable and enables
this to now succeed on Windows.
apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager