[TCLCORE] optionally disabling LARGEFILE64 support

[<da...@de...>]

Hi, with Rivet (Apache + Tcl), I've encountered the problem that
struct stat is of a different size depending on whether LARGEFILE64
support is compiled in or not.  I would like the means to disable it
at compile time...  is that feasible?  Possible?  Sensible?  I believe
this has the potential to cause problems not only with Apache, but
other systems that might share a module with Tcl - postgres, mysql, or
others...

Thankyou,
-- 
David N. Welton
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