[Bug bootstrap/109709] List of prerequisites should include that tar is required (not only for unpacking the source).

[me at manueljacob dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109709

--- Comment #8 from Manuel Jacob <me at manueljacob dot de> ---
As said in the original bug report, I’d understand if these prerequisites (like
tar and find) were left implicit (therefore this bug report could be closed
as-is), but the two suggestions by Jonathan Wakely seem reasonable to me.