- update to version 1.6.5
https://github.com/memcached/memcached/wiki/ReleaseNotes165
- drop link_sasl.patch issue is fixed
- dropped 635.patch and 634.patch: in 1.6.5 release

- update to version 1.6.4
https://github.com/memcached/memcached/wiki/ReleaseNotes163
https://github.com/memcached/memcached/wiki/ReleaseNotes164
- drop patches as they are included in the update:
https://github.com/memcached/memcached/pull/634
https://github.com/memcached/memcached/pull/635
- added link_sasl.patch: it seems libsasl2 wasnt linked which lead
to undefined references

- disable extstore also on ppc(64)
- limit tls support to 15 and above
- disable lto until the 2 settings structs are resolved