cmd/go: quote package directory when calling glob

cmd/go: quote package directory when calling glob

Fixes #53314

Change-Id: I4933b59ee247daec5cf96eb15c52ff54d3ec26a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/411696
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>