[fpc-pascal] Get variable name at runtime

[Marco van de Voort]

In our previous episode, Darius Blaszyk said:
> Here's why :)
> 
> Unfortunately pascal macro's are rather limited compared to C. I know I know, you could potentially open up a can of worms, but sometimes more control is required.

There is nothing restraining anybody using an external macro processor. It
is just that we don't want to support it :-)