windows: allow Windows-style printf debugging via MessageBox

I realize that at this time, x/sys/windows is most certainly not aiming
to be some sort of UI library or anything remotely close to that.
However, MessageBox is sort of the one universal Windows API that's used
even for console programs. It's *the* classic debugging helper. It's
even pretty customary for console programs to display their usage
message in a message box rather than stdout. I realize this might be
somewhat disturbing to consider if you're in the blissful Unix utopia,
but on Windows, this is just sort of how things roll. Easy access to
MessageBox() is important.

Change-Id: I16183b69e8a27a5ddaf73d1d4e106bb7b201a6f0
Reviewed-on: https://go-review.googlesource.com/c/sys/+/178899
Run-TryBot: Jason Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
3 files changed
tree: 175a4eeb0f929c7dad77cac2a3f9ed2a725f6e56
  1. cpu/
  2. plan9/
  3. unix/
  4. windows/
  5. .gitattributes
  6. .gitignore
  7. AUTHORS
  8. codereview.cfg
  9. CONTRIBUTING.md
  10. CONTRIBUTORS
  11. go.mod
  12. LICENSE
  13. PATENTS
  14. README.md
README.md

sys

This repository holds supplemental Go packages for low-level interactions with the operating system.

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