Add TCP socket options from glibc 2.2.4. Fixes #495680. 2.2.1 bugfix candidate.
Add TCP socket options from glibc 2.2.4. Fixes #495680.
2.2.1 bugfix candidate.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator