Build failure on OpenSUSE Leap 15.2

[hendi]

Compilation from latest git master fails on OpenSUSE even though ncurses-devel libraries are installed:

  = note: /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: /data/coins/grin/target/release/deps/libncurses-e0ac9ae217936705.rlib(ncurses-e0ac9ae217936705.ncurses.12v68zou-cgu.3.rcgu.o): in function `ncurses::constants::COLORS':
          ncurses.12v68zou-cgu.3:(.text._ZN7ncurses9constants6COLORS17h5b893e4b3099677aE+0x3): undefined reference to `COLORS'
          collect2: error: ld returned 1 exit status

This seems to be an issue related to ncurses-rs, see https://github.com/jeaye/ncurses-rs/issues/191