RLIMIT_AS is part of Single Unix... and presumably posix as well. So it

makes sense to support it everywhere rather than just on Linux.  So treat
it like RLIMIT_VMEM and RLIMIT_DATA.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80265 13f79535-47bb-0310-9956-ffa450edef68