fixed bug #92518 validation error were not covering namespace

* SAX.c valid.c include/libxml/valid.h: fixed bug #92518 validation
  error were not covering namespace declarations.
* result/valid/dia.xml test/valid/dia.xml: the test wasn't valid,
  it was missing the attribute declaration for the namespace
* result/VC/NS3: the fix now report breakages in that test
Daniel
7 files changed