fixed #129327 make sure parser flags get transmitted to the transformation

fixed #129327 make sure parser flags get transmitted to the transformation

* xsltproc.c: fixed #129327 make sure parser flags get transmitted to
  the transformation context
* libxslt/documents.c libxslt/transform.c libxslt/xsltInternals.h
  libxslt/xsltutils.c libxslt/xsltutils.h: add a new call
  xsltSetCtxtParseOptions() to update parsing options in document()
Daniel