Should Tcl/Tk extension ports use --enable-64bit?

[Christopher Chavez]

There is a configuration flag `--enable-64bit` included in the portfile 
for Tk, and is enabled as long as not building for universal.

This flag also appears to be available for Tcl and various Tcl/Tk 
extensions as well: Tix, Img, tktable, possibly others. Should those 
similarly be using `--enable-64bit`?

This is just a naïve observation--I currently do not observe any 
problems, compiler warnings, etc. that I would attribute to this option 
not being used, nor am aware of any explicit benefits.

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