apply patch fron Shaun McCance to hook xsl:message construct to the new

* libxslt/xsltutils.c: apply patch fron Shaun McCance to hook
  xsl:message construct to the new per-xsltTransformCtxt error
  callback if set up.
* Makefile.am: do not package svn files in releases
Daniel

svn path=/trunk/; revision=1424