[xml] Several commits

[Patrick Monnerat <patrick monnerat dh com>]

Hi Daniel,
  I've sent you (to this list) several patches about 1 year ago, but they have not been applied to the git 
repo.
- OS400 work (enables xmllint and xmlcatalog on OS400).
- Fix a bug: accept endOfDayFrag in xsd time and dateTime types.

As a convenience, I've applied these to an up-to-date libxml2 repository at 
https://github.com/monnerat/libxml2

Please feel free to clone it.

Cheers,
Patrick

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