[opendx-dev] fix to /html/Makefile.am

[Jari Vuoksenranta]

"
install-data-local:
        sh -c 'f=`pwd` ; \
               if test ! -d $(htmldir) ; then \
                   mkdir $(htmldir) ; \
               fi ; \
               chmod 755 $(htmldir); \
               cd $(htmldir) ; \
               tar xpoNf $$f/pages.tar ; \
               tar xpoNf $$f/images.tar ; \
               ln -s $(htmldir)/allguide.htm $(htmldir)/index.htm ; \
               ln -s $(htmldir)/allguide.htm $(htmldir)/index.html ; \
               cd $$f ; \
              '
"

irix6.5's tar also complains: "tape blocksize error" when
untaring "pages.tar" and "images.tar".