Make mod_cgi and mod_include work when compiled as DSO's again. This is

accomplished by moving suexec out of it's own file and into unixd.[ch].
The problem was that suexec.c wasn't being linked into the server unless
a module was actually using ap_os_create_process.  This is still not clean,
but it works now.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86772 13f79535-47bb-0310-9956-ffa450edef68