[MacPorts] #67923: gtk4 @4.10.4: add broadway variant

[MacPorts]

#67923: gtk4 @4.10.4: add broadway variant
-------------------------+--------------------
 Reporter:  diogob003    |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.8.1
 Keywords:               |       Port:  gtk4
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 I'm suggesting add a new variant
 ​[https://docs.gtk.org/gtk4/building.html#x11-backend-win32-backend-
 broadway-backend-wayland-backend-and-macos-backend broadway] to gtk3 and
 gtk4.

 Tell me what do you think?

 I need this to build some things, specially
 ​[https://gitlab.gnome.org/jpu/cambalache Cambalache] (an alternative to
 [https://ports.macports.org/port/glade Glade] that works with gtk4). No
 additional dependencies is required and there are no conflicts.

 It's just add this to gtk4 Portfile
 {{{
 variant broadway description {Enable the broadway (HTML5) gdk backend} {
     configure.args-append   -Dbroadway-backend=true
 }
 }}}
 And add this to gtk3 Portfile
 {{{
 variant broadway description {Enable the broadway (HTML5) gdk backend} {
     configure.args-append   -Dbroadway_backend=true
 }
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67923>
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