adb: win32: specify socket protocol

Instead of using socket(..., 0), pass IPPROTO_TCP or IPPROTO_UDP. Using
zero wasn't buying us anything and was different than popular apps like
Chrome. We should stick to what everyone else does so that we don't go
down different code-paths and potentially hit Winsock service provider
issues that everyone else is (accidentally) avoiding.

Also CHECK() if send() returns an erroneous value as described in the
Chromium source.

Also add comment about socket buffer sizing and Windows Vista.

Change-Id: I63db8f6de352fe1e9525cbc9cfc040eb02a4b9cd
Signed-off-by: Spencer Low <CompareAndSwap@gmail.com>