change ap_unix_create_privileged_process() to allocate enough space in

change ap_unix_create_privileged_process() to allocate enough space in
the newargs array to allow for a null terminator.  This allows suexec and
mod_cgid to work together reliably.

Apparently, rounding up the size to a multiple of 8 bytes in apr_palloc
hid the problem sometimes.  At other times, suexec would complain
about a null command name.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92627 13f79535-47bb-0310-9956-ffa450edef68