[MacPorts] #64332: gdal: fix whitespace

[MacPorts]

#64332: gdal: fix whitespace
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  Veence
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.1
 Keywords:              |       Port:  gdal
------------------------+----------------------
 The gdal portfile includes the standard modeline but its whitespace does
 not conform to that modeline. (Consult the output of `port lint`.)

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Ticket URL: <https://trac.macports.org/ticket/64332>
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