[MacPorts] #39729: Add chemistry keyword to bkchem portfile

[MacPorts]

#39729: Add chemistry keyword to bkchem portfile
-------------------------+--------------------------------
 Reporter:  c.herbig@…   |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  bkchem
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 Append chemistry to keywords so that it will show up in the chemistry
 category.

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Ticket URL: <https://trac.macports.org/ticket/39729>
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