scripts/functions: svn retrieval first tries the mirror for tarballs

The svn download helper looks for the local tarballs dir to see if it
can find a pre-downloaded tarball, and if it does not find it, does
the actual fetch to upstream via svn.

In the process, it does not even try to get a tarball from the local
mirror, which can be useful if the mirror has been pre-populated
manually (or with a previously downloaded tree).

Fake a tarball get with the standard tarball-download helper, but
without specifying any upstream URL, which makes the helper directly
try the LAN mirror.

Of course, if no mirror is specified, no URL wil be available, and
the standard svn retrieval will kick in.

Reported-by: ANDY KENNEDY <ANDY.KENNEDY@adtran.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

--- strace-orig/file.c	2008/05/20 04:56:18	1.92

+++ strace/file.c	2008/08/01 01:13:10	1.93

@@ -28,21 +28,22 @@

  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  *

- *	$Id: file.c,v 1.92 2008/05/20 04:56:18 roland Exp $

+ *	$Id: file.c,v 1.93 2008/08/01 01:13:10 roland Exp $

  */

 #include "defs.h"

 #include <dirent.h>

+

 #ifdef LINUX

-#define dirent kernel_dirent

-#define dirent64 kernel_dirent64

-#include <linux/types.h>

-#include <linux/dirent.h>

-#undef dirent

-#undef dirent64

+struct kernel_dirent {

+	unsigned long   d_ino;

+	unsigned long   d_off;

+	unsigned short  d_reclen;

+	char            d_name[1];

+};

 #else

-#define kernel_dirent dirent

+# define kernel_dirent dirent

 #endif

 #ifdef LINUX