[libxml2] win32: Fix build with VS2013

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 5bfaf2305997a6d1c49a6b23c2cc9c8c32d8c17c
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Tue Oct 11 13:00:33 2022 +0200

    win32: Fix build with VS2013
    
    Should fix #420.

 include/win32config.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/include/win32config.h b/include/win32config.h
index bbf3fee8..2b113237 100644
--- a/include/win32config.h
+++ b/include/win32config.h
@@ -9,9 +9,13 @@
 #define HAVE_STDINT_H
 #endif
 
-#if defined(_MSC_VER) && _MSC_VER < 1900
+#if defined(_MSC_VER)
+#if _MSC_VER < 1900
 #define snprintf _snprintf
-#define vsnprintf _vsnprintf
+#endif
+#if _MSC_VER < 1500
+#define vsnprintf(b,c,f,a) _vsnprintf(b,c,f,a)
+#endif
 #endif
 
 #endif /* __LIBXML_WIN32_CONFIG__ */