Change the ulimit command used by apachectl on AIX so that it

works in all locales.

the standard command fails in a non-English locale if the hard
limit is unlimited since the display of the limit will translate
"unlimited", but ulimit only accepts English "unlimited" on input


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@98277 13f79535-47bb-0310-9956-ffa450edef68