[MacPorts] #46838: fix breakage in rNMR 1.1.7 against recent R pacakage

[MacPorts]

#46838: fix breakage in rNMR 1.1.7 against recent R pacakage
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 Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
     Type:  update                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.3
 Keywords:                         |       Port:  rNMR
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 The current rNMR package fails to open its tcl/tk windows at runtime due
 to a change in the R package since the rNMR package was added 3 years ago.
 At that time, I was guided to install the cran package in
 ${destroot}${prefix}/lib/R/library/${name} but now apparently MacPorts R
 no longer checks that directory and the rNMR cran package has to be
 installed in
 ${destroot}${prefix}/Library/Frameworks/R.framework/Resources/library/${name}
 instead. The attached Portfile diff and revised rNMR.sh makes this change
 and allows stock rNMR to properly open its tcltk windows again.

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Ticket URL: <https://trac.macports.org/ticket/46838>
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