This reverts commit cab28503ad5e6fb516845890a06e4f8693d0ea16, reversing
changes made to 5313f1096a3c634e116bf3f5a71772103b7c4178 (but retaining
the meta updates).
The update to 2.11 breaks the darwin toolchain, see discussion at
https://github.com/NixOS/nixpkgs/pull/16507
Once the issues with 2.11 are worked out, this revert can be reverted.
Apparently, Darwin evaluation is somehow busted without this, although
I can't verify it. Reported by @matthewbauer on IRC. I'll take the
blame if this somehow makes life worse.
/cc @vrthra as maintainer
Signed-off-by: Austin Seipp <aseipp@pobox.com>