[MacPorts] #56081: glib2, glib2-devel: update to latest stable release 2.56.0

[MacPorts]

#56081: glib2, glib2-devel: update to latest stable release  2.56.0
---------------------------------+------------------------
  Reporter:  dbevans             |      Owner:  ryandesign
      Type:  update              |     Status:  accepted
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  glib2, glib2-devel  |
---------------------------------+------------------------
Changes (by ryandesign):

 * status:  new => accepted


Comment:

 I'm working on this update. Give me a couple days. The appinfo patch needs
 to be remade because of upstream refactoring. And the upstream refactoring
 broke compatibility with 10.8 and earlier for which I have a patch. I'm
 also taking the opportunity to switch the portfiles over to using
 pkgconfig and autoreconf.

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Ticket URL: <https://trac.macports.org/ticket/56081#comment:1>
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