[MacPorts] #37532: fix blt for tk 8.6

[MacPorts]

#37532: fix blt for tk 8.6
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 Reporter:  howarth@…  |      Owner:  macports-tickets@…
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.1.2
 Keywords:             |       Port:  blt
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 The current blt packaging is broken since tk was updated to 8.6. The
 attached Portfile and additional patch-tk8.6 solves the build issues by...
 [[BR]]
 [[BR]]
 1) Passing -DUSE_INTERP_RESULT on cflags as was done for building eggdrop
 in http://botlending.com/docs/eggdrop/compile/21 .[[BR]]
 2) Patching  src/tkButton.c  to use Tcl_EvalObjEx() instead of the
 obsolete TkCopyAndGlobalEval() which is removed from tk 8.6.[[BR]]
 This change was modelled on those in tk itself at
 http://rkeene.org/projects/tcl/tk.fossil/ci/bd1165a06d?sbs=0 .

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Ticket URL: <https://trac.macports.org/ticket/37532>
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