[MacPorts] #22538: update apbs to new 1.2.0 release

[MacPorts]

#22538: update apbs to new 1.2.0 release
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 Reporter:  howarth@…                 |       Owner:  macports-tickets@…                   
     Type:  update                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:  1.8.1                                
 Keywords:  haspatch maintainer       |        Port:  apbs                                 
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Comment(by snc@…):

 I'm going to take the liberty to change the `master_sites` to the
 sourceforge mirror list provided by MacPorts.

 I've also created a variable `branch` to come up with the substring of the
 version used for the `distname`.

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Ticket URL: <http://trac.macports.org/ticket/22538#comment:2>
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