libftdi: autoreconf should happen for host as well

Fixes http://autobuild.buildroot.net/results/d30/d3090804149654e099d3bc9953d48fd920812bf4/build-end.log



The same patches gets applied for target and host, so we should do
autoreconf for the host as well.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>