https://issues.dlang.org/show_bug.cgi?id=13542

          Issue ID: 13542
           Summary: std.file.FileException has GetLastError() as a default
                    argument
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Phobos
          Assignee: nobody@puremagic.com
          Reporter: bugzilla@digitalmars.com

This has problems:

1. GetLastError() is not the same as errno, although D also has errno. So there's confusion and wrong documentation about the arguments.

2. FileException is never called by anyone other than std.file, so the constructor should be marked private.

3. The call to GetLastError() should be moved into the constructor body, in
order to reduce bloat (i.e. having code for it generated over and over at the
call site).

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