Minor fix; reported default --enable-debug state incorrectly.

configure.in

@@ -66,7 +66,7 @@ dnl Debug mode?
 dnl ---------------------------------------------------------------------
 
 AC_ARG_ENABLE(debug,
-[  --enable-debug             enable debug mode [default=yes]],
+[  --enable-debug             enable debug mode [default=no]],
                 , enable_debug=no)
 if test x$enable_debug = xyes; then
   if test x$ac_cv_prog_cc_g = xyes; then