big patch from Roumen Petrov finishing xsl:sort lang support with many

big patch from Roumen Petrov finishing xsl:sort lang support with many

* libxslt/xsltconfig.h.in libxslt/xslt.c libxslt/extensions.c
  libxslt/xsltlocale.c libxslt/preproc.c libxslt/xsltutils.c
  libxslt/xsltlocale.h libxslt/win32config.h configure.in
  config.h.in win32/configure.js: big patch from Roumen Petrov
  finishing xsl:sort lang support with many portability issues
  fixed and feedback from Nick Wellnhofer and Rob Richards
Daniel

svn path=/trunk/; revision=1488