Looks like some version of Android still fails with "servname not
supported for ai_socktype". It probably doesn't support
ai_socktype=SOCK_STREAM.

Updates #14576.

Change-Id: I77ecff147d5b759e3281b3798c60f150a4aab811
Reviewed-on: https://go-review.googlesource.com/23194Reviewed-by: Ian Lance Taylor <iant@golang.org>