[issue13210] Support Visual Studio 2010

[Richard Oudkerk]

Richard Oudkerk <shibturn at gmail.com> added the comment:

The problems with error numbers seem to be caused by the addition of a new section in errno.h:

/* POSIX SUPPLEMENT */
#define EADDRINUSE      100
#define EADDRNOTAVAIL   101
...
#define ETXTBSY         139
#define EWOULDBLOCK     140

Of these the only ones which clash with WSA equivalents are

EADDRINUSE
EADDRNOTAVAIL
EAFNOSUPPORT
EALREADY
ECONNABORTED
ECONNREFUSED
ECONNRESET
EDESTADDRREQ
EHOSTUNREACH
EINPROGRESS
EISCONN
ELOOP
EMSGSIZE
ENETDOWN
ENETRESET
ENETUNREACH
ENOBUFS
ENOPROTOOPT
ENOTCONN
ENOTSOCK
EOPNOTSUPP
EPROTONOSUPPORT
EPROTOTYPE
ETIMEDOUT
EWOULDBLOCK

I think the simplest solution is just to undefine these new "clashing" constants near the top of Modules/errnomodule.c and Objects/exceptions.c so that we fall back to the preferred WSA equivalents later.

I have tried this by cloning sandbox/vs2010port, reverting 

Objects/exceptions.c
Modules/posixmodule.c
Modules/errnomodule.c
Modules/_io/fileio.c

to "ancestor(vs2010,default)" and then applying the attached patch.  I get four failures:

test_distutils
test_email
test_import
test_packaging

This is an improvement over the tip of vs2010 (2fc5398b3115) where I get two additional failures

test_importlib
test_subprocess

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Added file: http://bugs.python.org/file25379/wsa_undef.patch

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