[MacPorts] #38572: glib2: fix livecheck

[MacPorts]

#38572: glib2: fix livecheck
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 Reporter:  cal@…        |      Owner:  ryandesign@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:               |       Port:  glib2
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 The glib2 livecheck does not detect new stable releases. Since glib2 is a
 GNOME project, it uses the "even majors are new stable releases"
 versioning scheme. The following patch takes that into account. Note that
 according to this new livecheck, glib2 is outdated (and the new version of
 gtk3, which is also outdated, requires a glib2 update).

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Ticket URL: <https://trac.macports.org/ticket/38572>
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