[lemon] fix gcc implicit-fallthrough warning
@@ -1941,7 +1941,7 @@ struct pstate *psp;
psp->preccounter = 0;
psp->firstrule = psp->lastrule = 0;
psp->gp->nrule = 0;
- /* Fall thru to next case */
+ /* Fall through */
case WAITING_FOR_DECL_OR_RULE:
if( x[0]=='%' ){
psp->state = WAITING_FOR_DECL_KEYWORD;
