fix #1014 (#1018)

* fix #1014

* remove unused code

* * optimize generate pb.go on Windows
* format code
* optimize console.go

* version rollback

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/rpc/generator/defaultgenerator.go

@@ -1,8 +1,6 @@
 package generator
 
 import (
-	"os/exec"
-
 	"github.com/tal-tech/go-zero/tools/goctl/util/console"
 )
 
@@ -21,21 +19,3 @@ func NewDefaultGenerator() Generator {
 		log: log,
 	}
 }
-
-// Prepare provides environment detection generated by rpc service,
-// including go environment, protoc, whether protoc-gen-go is installed or not
-func (g *DefaultGenerator) Prepare() error {
-	_, err := exec.LookPath("go")
-	if err != nil {
-		return err
-	}
-
-	_, err = exec.LookPath("protoc")
-	if err != nil {
-		return err
-	}
-
-	_, err = exec.LookPath("protoc-gen-go")
-
-	return err
-}