[MacPorts] #36898: apbs: fix documentation installation directory

[MacPorts]

#36898: apbs: fix documentation installation directory
---------------------------+-----------------------
  Reporter:  ryandesign@…  |      Owner:  howarth@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.2
Resolution:                |   Keywords:
      Port:  apbs          |
---------------------------+-----------------------

Comment (by khindenburg@…):

 Currently 1.4.0 installs this
 {{{
   /opt/local/share/apbs/doc/CMakeLists.txt
   /opt/local/share/apbs/doc/README
   /opt/local/share/apbs/doc/index.html
   /opt/local/share/apbs/doc/license/LICENSE.txt
   /opt/local/share/apbs/doc/license/license.html
   /opt/local/share/apbs/doc/programmer/Doxyfile.in
   /opt/local/share/apbs/doc/programmer/mainpage.h
 }}}

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Ticket URL: <https://trac.macports.org/ticket/36898#comment:2>
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