do not use --symlink for autoreconf

do not use --symlink for autoreconf

When packaging the can-utils, I understand, that the generation step for
autoconf should be done beforehand. However using the --symlink option in the
autoreconf step installs links instead of the actual files, which leads to a
build failure when trying to build on another host with different autotools
installed.

Signed-off-by: Andre Naujoks <nautsch2@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>