package/davfs2: bump to version 1.7.0
https://savannah.nongnu.org/forum/forum.php?forum_id=10244
https://git.savannah.nongnu.org/cgit/davfs2.git/tree/ChangeLog?h=rel-1-7-0
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>