[MacPorts] #59431: lablgtk2: Fix livecheck

[MacPorts]

#59431: lablgtk2: Fix livecheck
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  lablgtk2
------------------------+----------------------
 livecheck misidentifies version 3.0.beta5 as 3.0:

 {{{
 $ port liv lablgtk2
 lablgtk2 seems to have been updated (port version: 2.18.6, new version:
 3.0)
 }}}

 livecheck should be restricted to stable versions only.

-- 
Ticket URL: <https://trac.macports.org/ticket/59431>
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