pakage/erlang: fix host build without termcap (curses) library

We do not need termcap (curses) support in the host variant of erlang.

Fixes a bunch of autobuild failures;
    http://autobuild.buildroot.net/results/4be/4bef658b6815929058c769037211f7e0fc8d1f9c/
    http://autobuild.buildroot.net/results/726/72619ed15590a3a5a41b7c398d973766ecab0a2e/
    http://autobuild.buildroot.net/results/366/366439438549d5f7656be72f71dae3bb5f99c6b2/


    ...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Nathaniel Roach <nroach44@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>