This commit adds a patch to the libmemcached package that fixes the
build with gcc 7.x. Since libmemcached is barely maintained upstream,
the patch comes from the Fedora packages.
Fixes:
http://autobuild.buildroot.net/results/872b8e0e6a24cbc96e3ad9e0b8b47acdf6160ce0/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
