[3.12] community/claws-mail: security upgrade to 3.17.7
See: #12020 (closed)
(cherry picked from commit 50a68db6) (cherry picked from commit be8ac7096483c617ee24948c32a5aa8fb71f5a4b)
See: #12020 (closed)
(cherry picked from commit 50a68db6) (cherry picked from commit be8ac7096483c617ee24948c32a5aa8fb71f5a4b)