jbauch de4db11798 Support epoll in PhysicalSocketServer.
Only will be used if WEBRTC_POSIX and WEBRTC_LINUX are both defined and
"epoll_create" doesn't return an error. Otherwise the default "select"-based
IO loop will be used.

BUG=webrtc:7585

Review-Url: https://codereview.webrtc.org/2880923002
Cr-Commit-Position: refs/heads/master@{#18359}
2017-05-31 20:09:18 +00:00
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