runfiles,C++: create envvar list for subprocesses

Implement Runfiles::EnvVars so it's now possible
to propagate runfiles to subprocesses via
environment variables (RUNFILES_MANIFEST_FILE and
RUNFILES_DIR).

Subsequent commits will add more feataures:
- automatic Runfiles creation based on argv[0] and
  the envvars of this process

See https://github.com/bazelbuild/bazel/issues/4460

Change-Id: If9a37b1be13b9cbacf21a496305d60444fd660b2
PiperOrigin-RevId: 187858830
3 files changed
tree: f55bc72b869b085578af8e1be390cb00ec5be20b
  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.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
README.md

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