[MacPorts] #53747: lmdb : update to 0.9.19

[MacPorts]

#53747: lmdb : update to 0.9.19
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 Reporter:  RJVB      |      Owner:
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  haspatch  |       Port:  lmdb
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 Please find attached an update to lmdb 0.9.19 .

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Ticket URL: <https://trac.macports.org/ticket/53747>
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