Don't use GNU tar.

Problem here is that GNU tar creates tar archives which are not POSIX-compliant and cannot be unpacked using a POSIX tar program.
Typical oopsie is a developer uses binbuild to pack up an httpd release on a system which does not include gtar in the standard distro, but it's there on the developer's computer.  User downloads it and find that it won't unpack with standard tar, even though it claims to be a tar archive.  Blah.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97635 13f79535-47bb-0310-9956-ffa450edef68