File tools-packaging.patch of Package go1.11

Index: go/src/cmd/go/internal/load/pkg.go
===================================================================
--- go.orig/src/cmd/go/internal/load/pkg.go
+++ go/src/cmd/go/internal/load/pkg.go
@@ -1281,7 +1281,13 @@ func (p *Package) load(stk *ImportStack,
 			if cfg.BuildToolchainName == "gccgo" {
 				p.Target = filepath.Join(base.ToolDir, elem)
 			} else {
-				p.Target = filepath.Join(cfg.GOROOTpkg, "tool", full)
+				// If GOROOT_TARGET is set, then write to it for packaging purpose
+				gorootTarget := os.Getenv("GOROOT_TARGET")
+				if gorootTarget == "" {
+					p.Target = filepath.Join(cfg.GOROOTpkg, "tool", full)
+				} else {
+					p.Target = filepath.Join(gorootTarget, "pkg/tool", full)
+				}
 			}
 		}
 		if p.Target != "" && cfg.BuildContext.GOOS == "windows" {