NixOS/nixpkgs — pull request #3584 by errge (2014-08-14 00:46:55+00:00)
Title: Merge 3 runtime zlibs to 1

There were 3 zlibs laying around in case of linux:
- 1 used by gcc (for JAR handling in the Java frontend),
- 1 used by stdenv other tools (e.g. binutils),
- 1 for the rest of the system.

This was because of some knot-tying issues in the stage/round logic in
the linux specific pure stdenv builder.