wget: fix build error with gnutls

This fixes '/usr/lib/libgnutls.so: error adding symbols: File in wrong format' in do_configured.

Reported-by: Jack Mitchell <ml@communistcode.co.uk>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>