Can not find release-version file when only make pd-ctl

### What did you do?

make pd-ctl

### What did you expect to see?

no errors

### What did you see instead?

```
➜ pd git:(master) ✗ make pd-ctl
grep: /release-version: No such file or directory
CGO_ENABLED=0 go build -gcflags '' -ldflags '-X "github.com/tikv/pd/server/versioninfo.PDReleaseVersion=v4.0.0-rc.2-421-gc8ede749-dirty" -X "github.com/tikv/pd/server/versioninfo.PDBuildTS=2021-01-11 05:50:16" -X "github.com/tikv/pd/server/versioninfo.PDGitHash=c8ede74999345032ed441e2b0aa3b45808c8f9e0" -X "github.com/tikv/pd/server/versioninfo.PDGitBranch=master" -X "github.com/tikv/pd/server/versioninfo.PDEdition=Community" -X "github.com/pingcap-incubator/tidb-dashboard/pkg/utils/version.InternalVersion=" -X "github.com/pingcap-incubator/tidb-dashboard/pkg/utils/version.Standalone=No" -X "github.com/pingcap-incubator/tidb-dashboard/pkg/utils/version.PDVersion=v4.0.0-rc.2-421-gc8ede749-dirty" -X "github.com/pingcap-incubator/tidb-dashboard/pkg/utils/version.BuildTime=2021-01-11 05:50:17" -X "github.com/pingcap-incubator/tidb-dashboard/pkg/utils/version.BuildGitHash="' -o /home/.../pd/bin/pd-ctl tools/pd-ctl/main.go
```

### What version of PD are you using (`pd-server -V`)?
master (c8ede74999345032ed441e2b0aa3b45808c8f9e0)