add back --with-big-tables option to again support tables with more than 4 G rows

mysql51/mysql51.spec

@@ -182,6 +182,7 @@ Provides:     mysql = %{version}-%{release}
 %endif
         --without-readline \
         --without-libedit \
+        --with-big-tables \
         --with-low-memory \
         --disable-shared \
         $opt