For strange reasons, our MacOS build breaks old XTS code, due their
compiler suddenly not accepting old K&R style function declarations.
(weird: that happens only on the 25.0 release, not newer ones, even
they're using the same build hosts and XTS revisions).
Fixing this by adding a special hotfix branch on our XTS mirror,
where all old K&S style function declations have been converted
to modern ones.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>