[MacPorts] #47807: libjpeg-turbo: update to 1.4.0

[MacPorts]

#47807: libjpeg-turbo: update to 1.4.0
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  Reporter:  rjvbertin@…    |      Owner:  macports-tickets@…
      Type:  update         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:  haspatch
      Port:  libjpeg-turbo  |
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Comment (by ryandesign@…):

 You don't need to check `if {[variant_exists universal] && [variant_isset
 universal]}` because the `merger_host` and `merger_configure_args`
 variables that are being set are only used by the muniversal portgroup
 when the universal variant is set.

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Ticket URL: <https://trac.macports.org/ticket/47807#comment:4>
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