- Add patch to get WEXITSTATUS and WIFEXITED defined
    The issue is fixed in upstream's development repo, so the patch won't be
    needed with ncdu's next release.
- Depend on more commonly used libncurses instead of libncursesw
- Enable parallel build
- Update copyright

Signed-off-by: Charles Lehner <cel@celehner.com>

this fixes #137

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

Signed-off-by: Charles Lehner <celehner1@gmail.com>