[Dovecot] (minor) bug in configure

Hello, while reading config options for dovecot v1.2.10 I've noticed a very small bug:

# ./configure --help | egrep -- 'Dovecot|--with-gnu-ld' `configure' configures Dovecot 1.2.10 to adapt to many kinds of systems. --with-gnu-ld assume the C compiler uses GNU ld [default=no] --with-gnu-ld assume the C compiler uses GNU ld default=no

I think the latter entry should be removed.

Thanks for considering, Sandro