cmd/go: support shared libraries in 'go version' on Windows

cmd/go: support shared libraries in 'go version' on Windows

This change modifies 'go version' to support shared windows libraries.

Updates #48187

Change-Id: I2e8436b8df84fe76677106fa9ca02dcd1fb90e77
Reviewed-on: https://go-review.googlesource.com/c/go/+/391855
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>