[fpc-pascal] BNF grammar for fpc

[leledumbo]

> That may be because it is no longer possible to write a BNF grammar for
> these compilers due to the c-style extensions.

AFAIK if a parser can be made for an extension, so is the grammar.

> There are some language constructs that is simply not posible with a LL(1)
> parser,
> when comparing to the LALR(1).

For example, left recursion. Yes, I know LALR(1) can recognize this. But it
can be solved easily by transforming the grammar such that the recursion is
eliminated and LL(1) wins again.
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