Upgrade third-party modules:

o) lua from 0.9.16 to 0.9.18;
o) memc from 0.15 to 0.16;
o) postgres from 1.0rc5 to 1.0rc7;
o) rds-csv from 0.05 to 0.07.
o) rds-json from 0.13 to 0.14;
o) redis2 from 0.11 to 0.12;
o) set-misc from 0.28 to 0.29;

Remove needless patch for third-party postgres module, change
has been added to the upstream.