runtime: remove an obsolete file

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5686049

src/pkg/runtime/cgo/cgo.go

@@ -9,6 +9,18 @@ for details on using cgo.
 */
 package cgo
 
+/*
+
+#cgo darwin LDFLAGS: -lpthread
+#cgo freebsd LDFLAGS: -lpthread
+#cgo linux LDFLAGS: -lpthread
+#cgo netbsd LDFLAGS: -lpthread
+#cgo openbsd LDFLAGS: -lpthread
+#cgo windows LDFLAGS: -lm -mthreads
+
+*/
+import "C"
+
 // Supports _cgo_panic by converting a string constant to an empty
 // interface.
 

src/pkg/runtime/cgo/trigger.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.
-
-// This tells the go tool that this package builds using cgo.
-// TODO: Once we stop using Make, this import can move into cgo.go.
-
-package cgo
-
-/*
-
-#cgo darwin LDFLAGS: -lpthread
-#cgo freebsd LDFLAGS: -lpthread
-#cgo linux LDFLAGS: -lpthread
-#cgo netbsd LDFLAGS: -lpthread
-#cgo openbsd LDFLAGS: -lpthread
-#cgo windows LDFLAGS: -lm -mthreads
-
-*/
-import "C"