M_INVALID needs a value within the scope of METHODS so that unknown

methods can be access controlled. MMP must be bumped because this may
break binary compatibility for third-party modules.

PR: 3821


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82959 13f79535-47bb-0310-9956-ffa450edef68