Removed "ToolsVersion" from VS2005 C# projects, for compatibility with *Develops

CHANGES.txt

@@ -20,6 +20,7 @@ RC1 -> RC2
 - Enable Windows linking to shared libraries even with NoImportLib
   flag set (just in case)
 - Fixed handling of paths in links
+- Added "ToolsVersion" attribute to VS2005 and VS2008 C# projects
 
 
 -----

src/actions/vstudio/vs2005_csproj.tmpl

@@ -6,7 +6,7 @@
 	local vsversion, toolversion
 	if _ACTION == "vs2005" then
 		vsversion   = "8.0.50727"
-		toolversion = "2.0"
+		toolversion = nil
 	elseif _ACTION == "vs2008" then
 		vsversion   = "9.0.50727"
 		toolversion = "3.5"
@@ -70,7 +70,11 @@
 
 	-- end of preprocessing; template starts here --	
 %>
+<% if toolversion then %>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="<%= toolversion %>">
+<% else %>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<% end %>
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' "><%= premake.esc(this.solution.configurations[1]) %></Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>