Supplementary derivation for s3cmd, building from git HEAD.
s3cmd-1.5-pre-81e3842f7a: Use more precise naming convention.
s3cmd-1.5-pre-81e3842f7a: Use buildInputs, not propagatedBuildInputs.
Mark s3cmd-1.5-pre-81e3842f7a as low priority.
Revert "s3cmd-1.5-pre-81e3842f7a: Use buildInputs, not propagatedBuildInputs."

This reverts commit 01211ff333a8554a45fbf3147a6ac4e550523a59.
Merge branch 's3cmd-git' of git://github.com/fmapfmapfmap/nixpkgs