added 'const' in a couple of causes because Ben fixed this in the include...

added 'const' in a couple of causes because Ben fixed this in the include file. This fixes the compiler warning for all the sent_pw pointers


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81646 13f79535-47bb-0310-9956-ffa450edef68