[MacPorts] #50035: armadillo @6.300.2: update to 6.400.2

[MacPorts]

#50035: armadillo @6.300.2: update to 6.400.2
---------------------------------+--------------------------------
 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:  haspatch maintainer  |       Port:  armadillo
---------------------------------+--------------------------------
 armadillo has been updated to version 6.400.2. New this version:

 * expanded each_col(), each_row() and each_slice() to handle C++11 lambda
 functions
 * added ind2sub() and sub2ind()
 * fixes for corner cases in gmm_diag class

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Ticket URL: <https://trac.macports.org/ticket/50035>
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