quick but apparently working implementation of xi:fallback, should close

* xinclude.c: quick but apparently working implementation of
  xi:fallback, should close bug #89684
* Makefile.am test/XInclude/docs/fallback.xml
  result/XInclude/fallback.xml: added a basic test for fallback,
  and run with --nowarning to avoid a spurious warning
* configure.in: applied patch from Frederic Crozat for python
  bindings on AMD 64bits machines.
Daniel
6 files changed