Windows, protoc: create io_win32.{h,cc}

Create dedicated files for the long-path-aware
Windows implementations of open/access/mkdir.

This commit updates many BUT NOT ALL usages of
<io.h> functions in protobuf's code base. Reason
being is that there are no Bazel build rules for
the unittest files that include <io.h>, so I
decided to leave those alone.

Thanks to this commit I can now build Bazel with
MSVC without needing a short --output_user_base.

Fixes https://github.com/bazelbuild/bazel/issues/2634
See https://github.com/bazelbuild/bazel/issues/2107
See https://github.com/google/protobuf/issues/2891

Change-Id: I374726452300854a36e4628bb22cb7bbb12f3bad
10 files changed
tree: 6594744d16a8d9a9cc94f3ca34de0889668dc36a
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.sh
  13. compile.sh
  14. CONTRIBUTING.md
  15. CONTRIBUTORS
  16. ISSUE_TEMPLATE.md
  17. LICENSE
  18. LICENSE.txt
  19. README.md
  20. WORKSPACE
README.md

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