[MacPorts] #56288: port:leveldb : minor upgrade with build system fixes and tcmalloc variant

[MacPorts]

#56288: port:leveldb : minor upgrade with build system fixes and tcmalloc variant
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  Reporter:  RJVB     |      Owner:  (none)
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  haspatch
      Port:  leveldb  |
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Comment (by ryandesign):

 I wasn't aware of the existence of tcmalloc or leveldb's use of it until
 you brought it up in this ticket.

 I just don't want a port to have a variant that causes other ports that
 use that variant to build themselves differently. That's a pain to handle
 correctly, as the x11/quartz situation in MacPorts demonstrates.

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Ticket URL: <https://trac.macports.org/ticket/56288#comment:3>
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