Since CL 46037, the runtime is crashing after calling
exitThread on Plan 9.

The exitThread function shouldn't be called on
Plan 9, because the system manages thread stacks.

Fixes #22221.

Change-Id: I5d61c9660a87dc27e4cfcb3ca3ddcb4b752f2397
Reviewed-on: https://go-review.googlesource.com/70190
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>