Back-patch fixes for some issues in our Windows socket code into 9.1.

This is a backport of commit b85427f2276d02756b558c0024949305ea65aca5.
Per discussion of bug #4958.  Some of these fixes probably need to be
back-patched further, but I'm just doing this much for now.

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/ed597d0c322dd42c362701125d4ff55eb7b675f5

Modified Files
--------------
src/backend/port/win32/socket.c |   40 +++++++++++++++++++++++++-------------
src/backend/port/win32_latch.c  |   16 +++++++-------
2 files changed, 34 insertions(+), 22 deletions(-)

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