Version (X86_64) for struct_stat64 on Linux x86_64

[Chuck Blake]

Hi.  I realize that 64-bit phobos is relatively work in progress.  I thought
I'd contribute.  struct_stat64 is broken on Linux x86_64 which further breaks
an awful lot of file IO.  I have a small patch that fixes it.  I tested this
with gdc 2.051 within gcc-4.5.2, with an attached program and comparing to the
output from the 'stat' utility.  It is so basic and logic-free that I
seriously doubt environmental considerations matter.  This doesn't completely
fix file IO, but it at least gives it a running chance.  I can read files
under 8MB, for example. :)
begin 644 stat64_x86_64.patch
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`
end
begin 644 stat.d
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`
end