[libxml2] Fix compilation on older Visual Studio

[Daniel Veillard <veillard src gnome org>]

commit 8fc913fcc9d2c3fd5c76694cb4e631ca1242de37
Author: Daniel Veillard <veillard redhat com>
Date:   Wed Jun 6 11:29:29 2012 +0800

    Fix compilation on older Visual Studio
    
    For https://bugzilla.gnome.org/show_bug.cgi?id=666491
    
    Reported by Matt Budd <matt budd gmail com>, the added support
    for VS 2010 broke older version 2005 and 2008 because it assumed
    some of the defines where present in all versions, fix that
    to check the version of VS

 include/wsockcompat.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/include/wsockcompat.h b/include/wsockcompat.h
index c762a64..e6a1a99 100644
--- a/include/wsockcompat.h
+++ b/include/wsockcompat.h
@@ -41,7 +41,7 @@
 #define EWOULDBLOCK             WSAEWOULDBLOCK
 #define ESHUTDOWN               WSAESHUTDOWN
 
-#ifndef _MSC_VER
+#if (!defined(_MSC_VER) || (_MSC_VER < 1600))
 #define EINPROGRESS             WSAEINPROGRESS
 #define EALREADY                WSAEALREADY
 #define ENOTSOCK                WSAENOTSOCK