Remove IGNORE for memc and redis2 third-party modules.

Patches obtained from:
o) https://github.com/openresty/memc-nginx-module/commit/c08cb7043440e427867838caf21cfd1e6cb2127a
o) https://github.com/openresty/redis2-nginx-module/commit/8cc7304787ae9542db4feb50d9e27beb485caa0f