GitLab

Set the user and group of all files to root for tar versions which
support it. Add explanatory comments for supporting that feature with
other tar versions.

Use LC_ALL instead of LANG everywhere.

Corresponding to flashrom svn r644.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>