contrib/diffall: eliminate use of tar
contrib/diffall: eliminate use of tar

The 'tar' utility is not available on all platforms (some only support
'gnutar').  An earlier commit created a work-around for this problem,
but a better solution is to eliminate the use of 'tar' completely.

Signed-off-by: Tim Henigan <87cde53fee35ccd1f5f73fcc5c91a1926c74a61a@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git