cmd/dist: skip fips140test in exe mode on Android

cmd/dist: skip fips140test in exe mode on Android

Android does not support non-PIE linking. Skip the test.

Change-Id: I53071538c82f1e1f96eed1a2619f92eacd18d263
Reviewed-on: https://go-review.googlesource.com/c/go/+/637495
Run-TryBot: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>