Added MODULE_MAGIC_COOKIE as the first field in a module structure to

allow us to distinguish between a garbled DSO (or even a file which isn't
an Apache module DSO at all) and a DSO which doesn't match the current
Apache API.

Submitted by: Ralf S. Engelschall
PR: 3152


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82565 13f79535-47bb-0310-9956-ffa450edef68