[MacPorts] #53747: lmdb : update to 0.9.19

[MacPorts]

#53747: lmdb : update to 0.9.19
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  Reporter:  RJVB    |      Owner:  (none)
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  haspatch
      Port:  lmdb    |
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Comment (by RJVB):

 actually, lmdb is at 0.9.23 since a while already. The other changes are
 just to make the port platform-agnostic and thus not something I'm going
 to insist on.

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Ticket URL: <https://trac.macports.org/ticket/53747#comment:7>
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