[atkmm] MSVC Builds: Update .sln File to 2013 Format

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

commit a9b5b776858bc8927858f9c3f44bc0d93228698a
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Sep 10 19:32:04 2015 +0800

    MSVC Builds: Update .sln File to 2013 Format
    
    The solution file needs to be updated as well...

 MSVC_Net2013/atkmm.sln |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/MSVC_Net2013/atkmm.sln b/MSVC_Net2013/atkmm.sln
index 85df136..0be4b8d 100644
--- a/MSVC_Net2013/atkmm.sln
+++ b/MSVC_Net2013/atkmm.sln
@@ -1,5 +1,5 @@
-Microsoft Visual Studio Solution File, Format Version 11.00
-# Visual Studio 2010
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2013
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "atkmm", "atkmm.vcxproj", 
"{9FE0D5A6-458C-45C7-B954-2C3C1E6196C2}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "gendef", "gendef.vcxproj", 
"{07324745-C9BE-4D65-B08A-9C88188C0C28}"