Update ncdu to 1.13

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

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

- Update version
- Use https
- Remove patch which is merged into 1.12

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

- 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>