[m-rev.] Fwd: for review: fix obsolete tcl-tk code in extras/graphics/mercury_tcltk

[Fabrice Nicol]

As a modest proposal for review by anyone.

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Bug issue (fixed): building libmercury_tcltk crashes with current tcl-tk 
releases (8.6+).

As a consequence, samples/calc cannot be built either.

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Proposed fix:

extras/graphics/mercury_tcltk/mtcltk.m:

         As of 2012-2013, 'result' fields in TCL_Interp structures have 
been obsoleted.

         They have been replaced with calls to function 
'Tcl_GetStringResult'.

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Fix was tested under Gentoo Linux (amd64 branch, tk version 8.6.11.1) by 
building application 'calc' in directory 'samples'.

Fabrice
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