Switch the default to new object files.

Internal linking cgo is disabled for now, as it does not work yet
in newobj mode.

Shared libraries are also broken.

Disable some tests that are known broken for now.

Change-Id: I8ca74793423861d607a2aa7b0d89a4f4d4ca7671
Reviewed-on: https://go-review.googlesource.com/c/go/+/200161
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>