[MacPorts] #71078: valkey @8.0.1: Build error

[MacPorts]

#71078: valkey @8.0.1: Build error
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  Reporter:  GarrettAlbright  |      Owner:  mohd-akram
      Type:  defect           |     Status:  closed
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.10.2
Resolution:  fixed            |   Keywords:
      Port:  valkey           |
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Comment (by mohd-akram):

 This was already fixed but it was reverted when I updated Valkey to 8.0.1
 while cleaning up the portfile. I added the same code back. I hadn't seen
 #40656 so the fix seemed weird and probably outdated, but `-isystem` makes
 a bit more sense now.

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Ticket URL: <https://trac.macports.org/ticket/71078#comment:4>
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