Revert "cmd/link: default to external linking with cgo std packages"

This reverts CL 470298.

Reason for revert: causes issues with Google internal testing.

Updates #58619.
Updates #58620.

Change-Id: Ic6601820ba8758ef96b71e32d9ffc549c36d5c98
Reviewed-on: https://go-review.googlesource.com/c/go/+/470835
Reviewed-by: Russ Cox <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Than McIntosh <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>

Author: thanm

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

@@ -1118,6 +1118,9 @@ var hostobj []Hostobj
 var internalpkg = []string{
 	"crypto/internal/boring",
 	"crypto/internal/boring/syso",
+	"crypto/x509",
+	"net",
+	"os/user",
 	"runtime/cgo",
 	"runtime/race",
 	"runtime/race/internal/amd64v1",