[MacPorts] #32018: mirror_sites.tcl fails to handle :port in URLs

[MacPorts]

#32018: mirror_sites.tcl fails to handle :port in URLs
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 Reporter:  bettybronner@…          |       Owner:  macports-tickets@…                   
     Type:  defect                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:  MacPorts Future                      
Component:  base                    |     Version:  2.0.3                                
 Keywords:                          |        Port:                                       
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Comment(by macosx12345@…):

 My first patch was breaking the case where there is a `mirror_tag` and a
 single colon in the URL. This second version improves the situation.

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Ticket URL: <https://trac.macports.org/ticket/32018#comment:5>
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