[MacPorts] #70172: gcr @3.41.2: build fails on systems without python3

[MacPorts]

#70172: gcr @3.41.2: build fails on systems without python3
--------------------+----------------------
 Reporter:  kencu   |      Owner:  dbevans
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  gcr
--------------------+----------------------
 during the install phase, gcr runs several scripts that call python3.

 On systems that don't have a python3, the build fails.

 {{{
 FAILED: install script
 '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_gnome_gcr/gcr/work/gcr-3.41.2/meson_post_install.py
 share lib 3 1.0.0' failed with exit code 127.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70172>
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