[bigloo] file-size for large files

[Sven Hartrumpf]

Hi all.

file-size for bigloo in 64-bit mode returns correct numbers for large files:

> (file-size "n.db")
#e154376286080

In i386 and x32 mode, the results for the same file are incorrect:

#e-1

#e-242536576

Ciao
Sven