[MacPorts] #63748: xsel 1.2.0 fails to build on macOS 12.0.1

[MacPorts]

#63748: xsel 1.2.0 fails to build on macOS 12.0.1
---------------------------+------------------------
  Reporter:  derekschrock  |      Owner:  ryandesign
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  monterey
      Port:  xsel          |
---------------------------+------------------------

Comment (by derekschrock):

 Update the patch to `x11/xsel` instead of patching/replace but to default
 AC_FUNC_FORK's vfork function check to yes so in turn doesn't create the
 macro.

 Reverted the revision bump and checked for darwin before os.major.

 https://github.com/derekschrock/macports-
 ports/commit/066d3a2b2c529d16856a5775221da52ca51fc1d5

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Ticket URL: <https://trac.macports.org/ticket/63748#comment:9>
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