ncftp: fix cross-compilation test

The cross-compilation test is based on the ability to run
a test program on the host, which is wrong.

If it runs, then the configure script concludes
that we're doing native compilation,
if it doesn't run, we're doing cross-compilation.

The configure script needs to be regenerated to fix the
cross-compilation test.

Fixes
http://autobuild.buildroot.net/results/969/969a49ae97a50634ea846a82b9c360e4fb020ace/build-end.log



Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>