[LEDE-DEV] Build error since ncurses bump

[Jo-Philipp Wich]

Hi,

> Hmm? I believe jow is talking about the toolchain. It was switched
> to default to GCC7 recently.
> 
> I use Arch Linux

parts of ncurses are built on the host (mainly the tic compiler) using
the host gcc. Arch linux is a bad reference for testing tools updates as
it tends to use software versions not being available on various LTS
distributions.

~ Jo