The compiler does not need it anymore, has not needed it for many years
iirc. This just goes in and pollutes the environment overriding the
users GOPATH and causing grief.
Go even warns about it itself, without vs with this commit:
```sh
~> go env GOPATH
/home/manny/go
~> nix-shell -p go
~> go env GOPATH
warning: GOPATH set to GOROOT (/nix/store/gvw1mfpdrk7i82884yhxf9lf5j3c12zm-go-1.14.1/share/go) has no effect
/nix/store/gvw1mfpdrk7i82884yhxf9lf5j3c12zm-go-1.14.1/share/go
~> exit
~> nix-shell -I nixpkgs=cloned/NixOS/nixpkgs -p go
~> go env GOPATH
/home/manny/go
~> exit
```
* treewide Drop unneeded go 1.12 overrides
* Fix packr to be go module compatible.
I updated to version 2.8.0 which is the latest on master.
Then due to the 2 different sets of go modules which are used, I split
the build into two different derivations, then merged them togethor
using symlinkJoin to have the same output structure as the existing derivation.
* Remove consul dependency on go1.12
I updated the consul version to 1.7.2 and flipped it to building using
modules.
* Remove go1.12 from perkeep.
Update the version to the latest unstable on master.
* Update scaleway-cli to not be pinned to go1.12
Switched the version to 1.20
* Update prometheus-varnish-exporter to not depend on go1.12
* Update lnd to build with go1.12
Updated the version
Forced only building subpackages with main to prevent panics over
multiple modules in one repo
* Remove go1.12 from openshift
Had to update the version to 4.1.0 and do a bit of munging to get this
to work
* Remove go1.12 completely.
These are no longer needed.
* Update bazel-watcher and make it build with go 1.14
Prepend the nix path to the zoneinfo.zip file and keep the original alternatives
to allow go programs built using nix to run on non nix servers.
see https://github.com/NixOS/nixpkgs/issues/54603
