cmd/dist: use debug/pe directly for cmd/link

Delete vendored copy.

Change-Id: I06e9d3b709553a1a8d06275e99bd8f617aac5788
Reviewed-on: https://go-review.googlesource.com/31011
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: rsc

misc/nacl/testzip.proto

@@ -36,11 +36,6 @@ go	src=..
 				gofmt_test.go
 				testdata
 					+
-			link
-				internal
-					pe
-						testdata
-							+
 			vendor
 				golang.org
 					x

src/cmd/dist/buildtool.go

@@ -60,10 +60,10 @@ var bootstrapDirs = []string{
 	"cmd/link/internal/arm64",
 	"cmd/link/internal/ld",
 	"cmd/link/internal/mips64",
-	"cmd/link/internal/pe",
 	"cmd/link/internal/ppc64",
 	"cmd/link/internal/s390x",
 	"cmd/link/internal/x86",
+	"debug/pe",
 	"math/big",
 }
 

src/cmd/link/internal/ld/ldpe.go

@@ -8,7 +8,7 @@ import (
 	"cmd/internal/bio"
 	"cmd/internal/obj"
 	"cmd/internal/sys"
-	"cmd/link/internal/pe"
+	"debug/pe"
 	"errors"
 	"fmt"
 	"io"