Fix "install" paths in VS property sheets

build/win32/vs10/gtk+.props

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Label="UserMacros">
-    <GlibEtcInstallRoot>..\..\..\..\..\vs10\$(Platform)</GlibEtcInstallRoot>
+    <GlibEtcInstallRoot>..\..\..\..\vs10\$(Platform)</GlibEtcInstallRoot>
     <CopyDir>$(GlibEtcInstallRoot)</CopyDir>
     <DefDir>$(SolutionDir)$(Configuration)\$(Platform)\obj\$(ProjectName)</DefDir>
     <GtkApiVersion>2.0</GtkApiVersion>

build/win32/vs9/gtk+.vsprops

@@ -374,6 +374,6 @@ copy $(ConfigurationName)\$(PlatformName)\bin\*-$(GtkApiVersion).lib $(OutDir)\l
 	/>
 	<UserMacro
 		Name="GlibEtcInstallRoot"
-		Value="..\..\..\..\..\vs9\$(PlatformName)"
+		Value="..\..\..\..\vs9\$(PlatformName)"
 	/>
 </VisualStudioPropertySheet>