Build one asio unit test

This requires two small porting tweaks. There are two strerror_r
variants out there in the wild, and two commonly used locations for
poll.h. Nudge us into the correct path for both.

Change-Id: Iba7982ec11efd481a48d30bd305da096a4004ff3
3 files changed
tree: 21666884afd12b21ba38a40f7ce93f543071cb9f
  1. asio/
  2. .gitignore
  3. BUILD.gn