removed yacc.r from EXTRA_DIST variable
removed yacc.r from EXTRA_DIST variable

svn path=/trunk/StrategoXT/; revision=363

lichtemo/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt,metaborg/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,metaborg/strategoxt,metaborg/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt,metaborg/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt