Removed various -Wall warnings, such as unused variables, and made the

definition of no_set_limit only active when the conditions under which
it would be called exist given various #ifdef's of RLIMIT_ variables.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@76903 13f79535-47bb-0310-9956-ffa450edef68