backports

This is a nixpkgs overlay that contains temporary fixes for build failures or other issues, usually backported from the nixpkgs master branch. Each package defined in this overlay shall automatically disable itself once a certain condition is met, such as the upstream package being updated or the nixpkgs modification date passing a certain time.

This is in place because I am extremely forgetful; I will almost certainly forget to undo a temporary fix later, so this takes care of it for me.