[glib] Visual Studio builds: Visual Studio 2013 and later has va_copy()

[Chun-wei Fan <fanchunwei src gnome org>]

commit ad49479265d061eb73682648feb550b105c3898c
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Jun 14 11:48:27 2017 +0800

    Visual Studio builds: Visual Studio 2013 and later has va_copy()
    
    Update config.h.win32.in and glib/glibconfig.h.win32.in to indicate so.

 config.h.win32.in          |    4 ++--
 glib/glibconfig.h.win32.in |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/config.h.win32.in b/config.h.win32.in
index b1c69df..eaf7e28 100644
--- a/config.h.win32.in
+++ b/config.h.win32.in
@@ -56,9 +56,9 @@
 #define GLIB_MINOR_VERSION @GLIB_MINOR_VERSION@
 
 /* A 'va_copy' style function */
-#ifndef _MSC_VER
+#if !defined (_MSC_VER) || (_MSC_VER >= 1800)
 #define G_VA_COPY va_copy
-#else /* _MSC_VER */
+#else /* _MSC_VER && _MSC_VER < 1800 */
 /* #undef G_VA_COPY */
 #endif /* _MSC_VER */
 
diff --git a/glib/glibconfig.h.win32.in b/glib/glibconfig.h.win32.in
index ab7e68d..9a91c5e 100644
--- a/glib/glibconfig.h.win32.in
+++ b/glib/glibconfig.h.win32.in
@@ -168,9 +168,9 @@ typedef unsigned __int64 guintptr;
 #define G_PLATFORM_WIN32
 @GLIB_WIN32_STATIC_COMPILATION_DEFINE@
 
-#ifndef _MSC_VER
+#if !defined (_MSC_VER) || (_MSC_VER >= 1800)
 #define G_VA_COPY      va_copy
-#endif /* not _MSC_VER */
+#endif /* not _MSC_VER or 2013 or later */
 
 #ifndef _MSC_VER
 #define G_HAVE_ISO_VARARGS 1