[MacPorts] #49436: jags: update and fixes

[MacPorts]

#49436: jags: update and fixes
------------------------+-----------------------
 Reporter:  dstrubbe@…  |      Owner:  dmeliza@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:  haspatch    |       Port:  jags
------------------------+-----------------------
 Update to 4.0.0. Add license. Use compilers portgroup, greatly simplifying
 the Portfile. Fix use of vecLib framework which does not exist on Yosemite
 and later. Remove dependency on bison which does not seem to be used at
 all.

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Ticket URL: <https://trac.macports.org/ticket/49436>
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