Currently, the only thing that prevents a functioning 64-bit FICL build is
a few integer types that were intended to be fixed-width.
Changing them to C99 integer types allows building a functioning 64-bit
FICL.
While this isn't applicable to the default settings of any in-tree loaders,
it is necessary for a future Petitboot loader, due to the requirement that
it be compiled as a 64-bit program.