64-bit build option?

We just got our first question to the MySQL++ mailing list about 
building it for 64-bit Windows.  I was kind of surprised to see that 
there seems to be no way to change the bkl file to cause generation of 
64-bit vcproj files.

Here's some diffs that may help in creating the feature:

In *.sln:

>         GlobalSection(SolutionConfigurationPlatforms) = preSolution
> -               Release|Win32 = Release|Win32
> -               Debug|Win32 = Debug|Win32
> +               Debug|x64 = Debug|x64
> +               Release|x64 = Release|x64
>         EndGlobalSection

and:

> -               {FF09D392-E501-5DAB-B5A9-B1B97E246D37}.Debug|Win32.ActiveCfg = Debug|Win32
> -               {FF09D392-E501-5DAB-B5A9-B1B97E246D37}.Debug|Win32.Build.0 = Debug|Win32
> +               {FF09D392-E501-5DAB-B5A9-B1B97E246D37}.Release|x64.ActiveCfg = Release|x64
> +               {FF09D392-E501-5DAB-B5A9-B1B97E246D37}.Release|x64.Build.0 = Release|x64

In each .vcproj file:

>         <Platforms>
>                 <Platform
>                         Name="Win32"
>                 />
> +               <Platform
> +                       Name="x64"
> +               />
>         </Platforms>

Personally, I'm only looking to do an either/or build, not both 
platforms at once.  So, I think you can just change "Win32" to "x64" 
here, rather than add the second <Platform> tag.

I got a bunch of other diffs, but nothing that seemed relevant.  It all 
looked like stuff Visual Studio just added when rewriting the file.

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