cmd/gomobile: tidy a few unused code and variables

Change-Id: I979589adf74ec0cd097ef7acc6c120f6557c8f25
Reviewed-on: https://go-review.googlesource.com/c/mobile/+/369201
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

Author: changkun

cmd/gomobile/build.go

@@ -271,11 +271,6 @@ func addBuildFlagsNVXWork(cmd *command) {
 	cmd.flag.BoolVar(&buildWork, "work", false, "")
 }
 
-type binInfo struct {
-	hasPkgApp bool
-	hasPkgAL  bool
-}
-
 func init() {
 	addBuildFlags(cmdBuild)
 	addBuildFlagsNVXWork(cmdBuild)

cmd/gomobile/env.go

@@ -14,13 +14,9 @@ import (
 
 // General mobile build environment. Initialized by envInit.
 var (
-	gomobilepath string // $GOPATH/pkg/gomobile
-
-	androidEnv map[string][]string // android arch -> []string
-
-	appleEnv map[string][]string
-
-	androidArmNM string
+	gomobilepath string              // $GOPATH/pkg/gomobile
+	androidEnv   map[string][]string // android arch -> []string
+	appleEnv     map[string][]string
 	appleNM      string
 )
 

cmd/gomobile/init.go

@@ -208,12 +208,6 @@ func installOpenAL(gomobilepath string) error {
 	return nil
 }
 
-var commonPkgs = []string{
-	"golang.org/x/mobile/gl",
-	"golang.org/x/mobile/app",
-	"golang.org/x/mobile/exp/app/debug",
-}
-
 func mkdir(dir string) error {
 	if buildX || buildN {
 		printcmd("mkdir -p %s", dir)
@@ -237,16 +231,6 @@ func symlink(src, dst string) error {
 	return os.Symlink(src, dst)
 }
 
-func rm(name string) error {
-	if buildX || buildN {
-		printcmd("rm %s", name)
-	}
-	if buildN {
-		return nil
-	}
-	return os.Remove(name)
-}
-
 func doCopyAll(dst, src string) error {
 	return filepath.Walk(src, func(path string, info os.FileInfo, errin error) (err error) {
 		if errin != nil {