erlang: fix host version dependencies

Fixes http://autobuild.buildroot.net/results/8816fe16534062cdf0d3a682a7408f9adbea2985



The host version of erlang does not need to enable support for & depend on
host versions of ncurses/openssl/zlib, even if the target version does.

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