[MacPorts] #38574: gdk-pixbuf2: fix livecheck

[MacPorts]

#38574: gdk-pixbuf2: fix livecheck
-------------------------+-------------------------
 Reporter:  cal@…        |      Owner:  devans@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:               |       Port:  gdx-pixbuf2
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 The gdk-pixbuf2 livecheck does not detect new stable releases. Since gdk-
 pixbuf2 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 Note that according to this new livecheck, gdk-pixbuf2 is outdated (and
 the new version of gtk3, which is also outdated, requires a gdk-pixbuf2
 update).

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Ticket URL: <https://trac.macports.org/ticket/38574>
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