[fpc-pascal] DOOM game for FPC

[L505]

I'm not an expert in game programming.. so I don't know much about BSP. But the
keyboard runs at least 4 times as slow, and I still don't see why the game would be
any different on the same code base. The keyboard running 4 times as slow shouldn't
be related to BSP, so there are other issues too, than just graphics.

The FPC team always requested a real world example of the same code in freepascal
running several times slower than in delphi. Now optimally, I hope it is  simply a
"bad code" issue in which delphi cleans up more than FPC.

Jimmy is going to look into the FPC code too. But at least we have a real world, in
practise example of where Delphi may (or may not, if this is bad code) be several
times faster than freepascal.