buildroot

memcached: bump version to 1.4.36

From the release notes
(https://github.com/memcached/memcached/wiki/ReleaseNotes1436):

Important bug fix that could lead to a hung slab mover.  Also improves
memory efficiency of chunked items.

[Peter: add release notes link / mention important bug fix]
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>