[fpc-pascal] fpc 2.0.0 x86_64 and assembler

[Peter Vreman]

> i tried to compile the bigint13 Unit from Franco Milani but got the
> following error:
>
> bigint13.pas(48,2) Error: Illegal assembler style specified "INTEL"
> bigint13.pas(426,1) Fatal: There were 1 errors compiling module, stopping
> bigint13.pas(426,1) Error: Compilation aborted
>
> The assembler mode is defined as:
>
> {$asmmode intel}
>
> If have installed yasm on my AMD64 System.

Only AT&T (gas) assembler is supported