[fpc-pascal] FPC version defines

[Marco van de Voort]

> What are the FPC defines for it's versions? I would like to separate
> some code from FPC 2.0.4 and FPC 2.2 (actually development 2.1) due to
> some bugs in 2.0.4 that were corrected on 2.1

http://delphi.wikia.com/wiki/FreePascal_detection_and_versioning