If we are submitting 2GB login forms, there is a very serious,

serious problem.  The len and form_size of size_t should be
adaquate, clean up the rest of the size/off mismatches.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@664230 13f79535-47bb-0310-9956-ffa450edef68