MSBuild: remove AssemblyInfo.cs where it's not present

The only autogenerated AssemblyInfo files are in cairo and in
gtk-sharp's root, not inside other libraries like atk, glib, etc.
Removing them will make MonoDevelop stop rendering a red element
underneath each project.

atk/atk.csproj

@@ -33,7 +33,6 @@
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
-    <Compile Include="AssemblyInfo.cs" />
     <Compile Include="Global.cs" />
     <Compile Include="Hyperlink.cs" />
     <Compile Include="Misc.cs" />

gdk/gdk.csproj

@@ -33,7 +33,6 @@
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
-    <Compile Include="AssemblyInfo.cs" />
     <Compile Include="Atom.cs" />
     <Compile Include="Color.cs" />
     <Compile Include="Device.cs" />

gio/gio.csproj

@@ -34,7 +34,6 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
     <Compile Include="AppInfoAdapter.cs" />
-    <Compile Include="AssemblyInfo.cs" />
     <Compile Include="DBusInterfaceVTable.cs" />
     <Compile Include="IFile.cs" />
     <Compile Include="FileAdapter.cs" />

glib/glib.csproj

@@ -34,7 +34,6 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
     <Compile Include="Argv.cs" />
-    <Compile Include="AssemblyInfo.cs" />
     <Compile Include="ConnectBeforeAttribute.cs" />
     <Compile Include="DefaultSignalHandlerAttribute.cs" />
     <Compile Include="DestroyNotify.cs" />

pango/pango.csproj

@@ -34,7 +34,6 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
     <Compile Include="Analysis.cs" />
-    <Compile Include="AssemblyInfo.cs" />
     <Compile Include="AttrBackground.cs" />
     <Compile Include="AttrColor.cs" />
     <Compile Include="AttrFallback.cs" />