sphinxsearch: 2.2.8 -> 2.2.11

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/rd3zgq55rdmmyd4rfbv2ij98bk55icic-sphinxsearch-2.2.11/bin/sphinxsearch-searchd -h` got 0 exit code
- ran `/nix/store/rd3zgq55rdmmyd4rfbv2ij98bk55icic-sphinxsearch-2.2.11/bin/sphinxsearch-searchd --help` got 0 exit code
- ran `/nix/store/rd3zgq55rdmmyd4rfbv2ij98bk55icic-sphinxsearch-2.2.11/bin/sphinxsearch-searchd -h` and found version 2.2.11
- ran `/nix/store/rd3zgq55rdmmyd4rfbv2ij98bk55icic-sphinxsearch-2.2.11/bin/sphinxsearch-searchd --help` and found version 2.2.11
- found 2.2.11 with grep in /nix/store/rd3zgq55rdmmyd4rfbv2ij98bk55icic-sphinxsearch-2.2.11
- found 2.2.11 in filename of file in /nix/store/rd3zgq55rdmmyd4rfbv2ij98bk55icic-sphinxsearch-2.2.11

cc "@ederoyd46"