code review 5731048: misc/cgo: re-enable some tests

src/pkg/go/build/build.go

 // Copyright 2011 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package build
 
 import (
         "bytes"
         "errors"
         "fmt"
@@ skipping 192 matching lines @@
                 }
         }
         return all
 }
 
 // Default is the default Context for builds.
 // It uses the GOARCH, GOOS, GOROOT, and GOPATH environment variables
 // if set, or else the compiled code's GOARCH, GOOS, and GOROOT.
 var Default Context = defaultContext()
 
+// This list is also known to ../../../cmd/dist/build.c.
 var cgoEnabled = map[string]bool{
         "darwin/386":    true,
         "darwin/amd64":  true,
         "linux/386":     true,
         "linux/amd64":   true,
         "freebsd/386":   true,
         "freebsd/amd64": true,
         "windows/386":   true,
         "windows/amd64": true,
 }
@@ skipping 736 matching lines @@
         switch goarch {
         case "386":
                 return "8", nil
         case "amd64":
                 return "6", nil
         case "arm":
                 return "5", nil
         }
         return "", errors.New("unsupported GOARCH " + goarch)
 }