runtime/race: use internal linking mode for amd64 subarch packages

CL 424034 introduced two new packages that trigger external
linking mode where internal linking mode is sufficient.

Change-Id: I81583210331fe4151d631b5efd7fc5d3c8f11f39
Reviewed-on: https://go-review.googlesource.com/c/go/+/435256
Run-TryBot: Than McIntosh <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: znkr

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

@@ -1081,6 +1081,8 @@ var internalpkg = []string{
 	"os/user",
 	"runtime/cgo",
 	"runtime/race",
+	"runtime/race/internal/amd64v1",
+	"runtime/race/internal/amd64v3",
 	"runtime/msan",
 	"runtime/asan",
 }