The epoll_wait functions need the rest of the epoll functions (create, ctl) to be available to actually test them, as well as pipe to create a usable file descriptor. This patch adds epoll_create, epoll_create1, epoll_ctl, and pipe. These have tests, and the tests for epoll_wait, epoll_pwait, and epoll_pwait2 (currently disabled) are updated to use these newly available functions.