[MacPorts] #50446: armadillo @6.400.3_0: update to 6.500.4

[MacPorts]

#50446: armadillo @6.400.3_0: update to 6.500.4
---------------------------------+--------------------------------
 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:  haspatch maintainer  |       Port:  armadillo
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 armadillo has been updated to version 6.500.4. New this version:

 * added conv2() for 2D convolution
 * added stand-alone kmeans() function for clustering data
 * added trunc()
 * extended conv() to optionally provide central convolution
 * faster handling of multiply-and-accumulate by accu() when using Intel
 MKL, ATLAS or OpenBLAS

 Notes:

 * master_sites moved to dl.bintray.com
 * drop boost from depends_lib, per upstream developer

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Ticket URL: <https://trac.macports.org/ticket/50446>
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