Fix a compile warning -- there was a const discarded with the recent

verbose-errors-to change.  Also move status_lines[] to constant storage
(better mem behaviour for kernels that do the right thing)... and let
the const be propagated through r->status_line (anything which didn't
treat that as a const before was broken -- now it'll be a compile
warning).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82846 13f79535-47bb-0310-9956-ffa450edef68