xerces codebase itself.
although this commit is a combination of all three PRs, i didn't take
every PR verbatim (and left out some smaller parts of the first two PRs).
any mistakes in the merging of these PRs is mine and if the original
submitters would like to generate diffs after this commit, i'll look at
those as well.
Gregory Bond gets credit for spotting some particularly nasty problems
in the old port. Remember folks, just because it compiles doesn't mean
it works..
PR: ports/36248, ports/37016, ports/37619
Submitted by: Hidekazu Kuroki <hidekazu@pc88.gr.jp>,
Daniel Lang <dl@leo.org>,
Gregory Bond <gnb@itga.com.au>
