Bazel client: reduce dependency on POSIX API

We can now compile blaze_util_windows.cc with
MSVC, yay! (when building //src:bazel
--cpu=x64_windows_msvc -k).

There are a lot of #ifdef's and TODOs so this
is a modest victory for now.

In this change:

- change blaze::MakeDirectories to return bool
instead of int, since that's how it was used
anyway, and to expect the permission mask as
unsigned int instead of mode_t, since the
former is good enough and compatible with
mode_t on POSIX while mode_t is not defined on
Windows

- move blaze::MakeDirectories into
blaze_util_<platform>

- implement envvar-handling in
blaze_util_<platform> and use it everywhere

See https://github.com/bazelbuild/bazel/issues/2107

--
MOS_MIGRATED_REVID=139887503
12 files changed
tree: ffb6e855db5cede6863890ddf06de3d35716dfef
  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.txt
  18. README.md
  19. WORKSPACE
README.md

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