[Bug 219749] math/metis: update IDXTYPEWIDTH to 64 on 64 bit platforms.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219749

            Bug ID: 219749
           Summary: math/metis: update IDXTYPEWIDTH to 64 on 64 bit
                    platforms.
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: pfg at FreeBSD.org

Created attachment 183172
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183172&action=edit
Port update patch

This appears documented in the INSTALL.txt file:
...
3. Edit the file include/metis.h and specify the width (32 or 64 bits) of the
   elementary data type used in METIS. This is controled by the IDXTYPEWIDTH
   constant.

   For now, on a 32 bit architecture you can only specify a width of 32, 
   whereas for a 64 bit architecture you can specify a width of either 
   32 or 64 bits.

...

It affects the case where there is a huge graph.

I decided not to touch REALTYPEWIDTH for now, since it is unclear what side
effects it may have.

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