[MacPorts] #71396: libheif fails building with target 10.14

[MacPorts]

#71396: libheif fails building with target 10.14
-----------------------+---------------------
 Reporter:  MStraeten  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.10.5
 Keywords:  10.14      |       Port:  libheif
-----------------------+---------------------
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libheif/libheif/work/libheif-1.19.5/examples/heif_enc.cc:687:29:
 error: 'parent_path' is unavailable: introduced in macOS 10.15
 :info:build     generator.directory = p.parent_path();
 :info:build                             ^
 :info:build
 /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk/usr/include/c++/v1/__filesystem/path.h:958:30:
 note: 'parent_path' has been explicitly marked unavailable here
 :info:build   _LIBCPP_HIDE_FROM_ABI path parent_path() const {
 :info:build                              ^
 :info:build fatal error: too many errors emitted, stopping now [-ferror-
 limit=]

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Ticket URL: <https://trac.macports.org/ticket/71396>
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