This is the only remaining svn url in OE-Core and building subversion-native
for things like the url checker is wearing and slows down builds. Since
this rarely changes, use the mirror tarball instead.
(From OE-Core rev: 0be6f3b5a69a65107b49a90bee98815a5a7ac9d8)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>