Make mod_so use ap_strerror instead of the old ap_os_dso_error. The

error codes for dso's will need to be added to strerror in order for
this to work fully.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85218 13f79535-47bb-0310-9956-ffa450edef68