sox: import from oldpackages, patches to build with newer ffmpeg versions

Signed-off-by: Ted Hess <thess@kitschensync.net>
Improve CONTRIBUTING.md

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>
Merge pull request #141 from champtar/contributing

Improve CONTRIBUTING.md
ncdu: fix makefile

this fixes #137

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