[fpc-pascal] locale solution for unix systems

[Marco van de Voort]

In our previous episode, Graeme Geldenhuys said:
> > But last time I tested libc was not available for FreeBSD. Hence the
> > reason I have code as follows (which only includes libc when the OS is
> > Linux on cpu386).
> 
> OK, maybe I am confusing myself - between the libc unit and the libc
> library as documented in:
>   http://wiki.freepascal.org/libc_unit#But_I_only_want..

(note that it is still better to use general units if they exist instead of
declararing your own, those will in time become hopelessly ifdeffed, and it
is easier for e.g. Beos/Haiku managers to check the packages/ tree than your
local source)