cmd/vendor: move cmd/internal/unvendor packages to cmd/vendor

Updates #14047

Change-Id: I4b150533393bfb90e840497095ac32bcca4f04c2
Reviewed-on: https://go-review.googlesource.com/23114
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

misc/nacl/testzip.proto

@@ -27,23 +27,23 @@ go	src=..
 			internal
 				objfile
 					objfile.go
-				unvendor
-					golang.org
-							x
-								arch
-									arm
-										armasm
-											testdata
-													+
-									x86
-										x86asm
-											testdata
-													+
 			gofmt
 				gofmt.go
 				gofmt_test.go
 				testdata
 					+
+			vendor
+				golang.org
+					x
+						arch
+							arm
+								armasm
+									testdata
+										+
+							x86
+								x86asm
+									testdata
+										+
 		archive
 			tar
 				testdata

src/cmd/internal/objfile/disasm.go

@@ -15,8 +15,8 @@ import (
 	"strings"
 	"text/tabwriter"
 
-	"cmd/internal/unvendor/golang.org/x/arch/arm/armasm"
-	"cmd/internal/unvendor/golang.org/x/arch/x86/x86asm"
+	"golang.org/x/arch/arm/armasm"
+	"golang.org/x/arch/x86/x86asm"
 )
 
 // Disasm is a disassembler for a given File.