Always initialize mutex and condition variables before use.

Rev: src/modules/Gdbm/gdbmmod.c:1.9
Rev: src/modules/HTTPLoop/accept_and_parse.c:1.11
Rev: src/modules/HTTPLoop/cache.c:1.8
Rev: src/modules/Msql/msqlmod.c:1.12
Rev: src/modules/Postgres/pgresult.c:1.12
Rev: src/modules/Postgres/postgres.c:1.17
Rev: src/modules/spider/spider.c:1.90
Rev: src/threads.c:1.120
Rev: src/threads.h:1.84