[fpc-pascal] FPC has multiple HTTP server components

[Marco van de Voort]

In our previous episode, Michael Van Canneyt said:
> >   fcl-net/src/httpsvlt.pp    (THTTPServer component)
> 
> This one is deprecated.
> 
> It was originally developed to create servlets for XML-RPC.
> I will remove it.

deprecate it first, then we'll merge the deprecation to 2.6.0, and people
have a full major release cycle to migrate to alternatives.