Ticket #47312 - replace PR_GetFileInfo with PR_GetFileInfo64
    
    https://fedorahosted.org/389/ticket/47312
    Reviewed by: mreynolds (Thanks!)
    Branch: master
    Fix Description: The directory server deals with very large files.  We need
    to use PR_GetFileInfo64 to make sure we can accurately calculate the sizes of
    these files.  Note that many places didn't use the info.size field, but were
    changed anyway in order to be consistent and discourage the use of
    PR_GetFileInfo.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no