[MacPorts] #17976: php5-dba: add a new variant for db4 support

[MacPorts]

#17976: php5-dba: add a new variant for db4 support
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 Reporter:  tinhkyaw@…          |       Owner:  ryandesign@…           
     Type:  enhancement         |      Status:  assigned               
 Priority:  Normal              |   Milestone:                         
Component:  ports               |     Version:  1.7.0                  
 Keywords:  db4                 |        Port:  php5-dba               
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Comment(by robert@…):

 FYI, I added the db4 variant patch above to my local php5-dba Portfile but
 was getting the same error: "checking for db4 major version... configure:
 error: Header contains different version".

 After adding @tinhkyaw's suggested symbolic links, I was able to install
 and test it successfully.

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Ticket URL: <https://trac.macports.org/ticket/17976#comment:7>
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