[gtk+] Update Visual Studio 2010 projects

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

commit 3741a3bfbe06291abc34cbe25e87315aa667a4e4
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon May 27 18:25:57 2013 +0800

    Update Visual Studio 2010 projects
    
    Add a PlatformToolset tag for each configuration for project files that
    do not yet have them.  This is to ease support for Visual Studio 2012 as
    we can copy and easily replace a few items with automated scripts as
    project files for Visual Studio 2010 and 2012 are very similar.
    
    This might change when we eventually support the Metro (aka Windows 8
    Modern UI), but this will suffice for the time being.

 build/win32/vs10/gengir.vcxproj                |    4 ++++
 build/win32/vs10/gtk3-demo-application.vcxproj |    4 ++++
 2 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/build/win32/vs10/gengir.vcxproj b/build/win32/vs10/gengir.vcxproj
index 3d94c27..b62124b 100644
--- a/build/win32/vs10/gengir.vcxproj
+++ b/build/win32/vs10/gengir.vcxproj
@@ -28,19 +28,23 @@
     <ConfigurationType>Utility</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Utility</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Utility</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Utility</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/build/win32/vs10/gtk3-demo-application.vcxproj b/build/win32/vs10/gtk3-demo-application.vcxproj
index c48d14b..3d69be4 100644
--- a/build/win32/vs10/gtk3-demo-application.vcxproj
+++ b/build/win32/vs10/gtk3-demo-application.vcxproj
@@ -28,19 +28,23 @@
     <ConfigurationType>Application</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
     <WholeProgramOptimization>false</WholeProgramOptimization>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
     <WholeProgramOptimization>false</WholeProgramOptimization>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <CharacterSet>MultiByte</CharacterSet>
+    <PlatformToolset>v100</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">