clean up some signed/unsigned discrepancies, hopefully with the absolute

minimum of casting; it wouldn't compile with AIX xlc otherwise (experience
says that Tru64 and HP-UX native compilers would be extremely unhappy too,
though I didn't try yet)

get rid of unused function deflate_insert_filter (trivial to put back
so no reason to #if 0)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92396 13f79535-47bb-0310-9956-ffa450edef68