[MacPorts] #61584: Use deployment target 10.16 on Big Sur

[MacPorts]

#61584: Use deployment target 10.16 on Big Sur
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  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  High         |  Milestone:  MacPorts 2.7.0
 Component:  base         |    Version:  2.6.4
Resolution:               |   Keywords:  bigsur
      Port:               |
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Comment (by mf2k):

 Maybe it should be a flag that can be set per port. So ports that use a
 correctly fixed libtool won't be broken. Something like:
 {{{
 use_libtool_bigsur_hack yes
 }}}
 Which sets the deployment target to 10.16.

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Ticket URL: <https://trac.macports.org/ticket/61584#comment:1>
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