[gollvm] package plugin is not in GOROOT (/usr/local/go/src/plugin)

[hohoho syncxxx]

Hello, I compile gollvm with:

```

/bin/bash -c cd /llvm-project && git checkout 96b0b9a5e && cd llvm/tools/gollvm && git checkout d30fc0bf && cd gofrontend && git checkout ae20684902 && git apply /tmp/gollvm.patch && cd ../libgo/libffi && git checkout 8111cd0692 && cd ../libbacktrace && git checkout f24e9f4

```

Then, I compile some project code by golang (my purpose is to compile this project to LLVM IR):

go build -gccgoflags -static-libgo -work -x mypackage.go

But I met an error when type this command in my terminal :

../go/pkg/mod/github.com/emitter-io/con...@v1.0.0/config.go:15:2: package plugin is not in GOROOT (/usr/local/go/src/plugin)

gollvm dont support that `plugin` package or my environment is wrong? 

[Ian Lance Taylor]

GoLLVM does not support the plugin package. This is
https://go.dev/issue/36403. As far as I know nobody is working on
this. Sorry.

Ian