package/ncurses: fixup library symlinks

As stated on the list we need to copy static libraries when doing static
targets so add the logic for that.

Also exclude the wide option for blackfin flat since there seem to be
toolchain issues with that combination - since it's a new feature option
someone interested might look into it later.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>