fix tar invocation in mkrel

fix tar invocation in mkrel

pull up r25395 from trunk

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 r25395 | tlyu | 2011-10-21 13:35:49 -0400 (Fri, 21 Oct 2011) | 10 lines

 ticket: 6989
 subject: fix tar invocation in mkrel
 target_version: 1.10
 tags: pullup

 Fix the tar invocation in mkrel so that it defaults to using "tar" as
 the tar program rather than "gtar".

 This should probably be pulled up to at least 1.9 and 1.8 as well.

ticket: 6990
version_fixed: 1.9.2
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-9@25396 dc483132-0cff-0310-8789-dd5450dbe970