bazel/grpc: include linux/tcp.h on Linux pre-glibc 2.17

Bazel 0.24.0 upgraded grpc from 1.13.0 to 1.18.0, and the latter makes use of
the TCP_USER_TIMEOUT socket option.  Problem:  grpc conditions the option on
the Linux kernel version but sources the option from glibc's `netinet/tcp.h`.
glibc != Linux kernel, and that option wasn't imported to glibc until 2.17.

We can't just build Bazel with glibc 2.17 because we still have to support
CentOS 6 dev nodes which ship with glibc 2.12.  So instead this change
tweaks the grpc headers to conditionally include <linux/tcp.h> instead of
<netinet/tcp.h>.

Resolves https://github.com/bazelbuild/bazel/issues/7890.
4 files changed
tree: 809e443cc61b7986e899e599a387316135a2df46
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
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