vchoi_fork

[svn-r9654] Purpose:

Description:  In file H5FDsec2.c and H5FDlog.c, there's statements like
     H5_ASSIGN_OVERFLOW(file->eof,sb.st_size,off_t,haddr_t);
It assumes sb.st_size from h5_stat_t is of type off_t.  But on Windows, it
has type __int64.  So the H5_ASSIGN_OVERFLOW statement may cause problem.
Instead of trying to do switch between Windows and other systems in H5FDsec2.c
and H5FDlog.c, define a substituting type in H5private.h to fix the problem.
On Windows, this type is __int64; on other systems, it is off_t.


Platforms tested:  fuss.  Simple fix.  Already did h5committest for v1.6.