[Bug 264926] graphics/gexiv2: doesn't build with lang/python39 due to static reference to python3.8

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264926

            Bug ID: 264926
           Summary: graphics/gexiv2: doesn't build with lang/python39 due
                    to static reference to python3.8
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: ohartmann@walstatt.org
                CC: cmt@freebsd.org, python@FreeBSD.org
                CC: cmt@freebsd.org, python@FreeBSD.org

With the transition from lang/python38 -> lang/python39 there is some fallout
from building ports depending on Python, especially

graphics/gexiv2

After upgrading according to /usr/ports/UPDATING for "portmaster", building 
fails with

[...]
===>  Building for gexiv2-0.14.0
[  4% 2/23] /usr/local/bin/meson --internal exe --capture gexiv2/gexiv2-enums.h
-- /usr/local/bin/glib-mkenums --identifier-prefix gexiv2 --symbol-prefix
GExiv2 --template
/usr/ports/graphics/gexiv2/work/gexiv2-0.14.0/_build/../gexiv2/gexiv2-enums.h.template
/usr/ports/graphics/gexiv2/work/gexiv2-0.14.0/_build/../gexiv2/gexiv2-metadata.h
/usr/ports/graphics/gexiv2/work/gexiv2-0.14.0/_build/../gexiv2/gexiv2-log.h
FAILED: gexiv2/gexiv2-enums.h 
/usr/local/bin/meson --internal exe --capture gexiv2/gexiv2-enums.h --
/usr/local/bin/glib-mkenums --identifier-prefix gexiv2 --symbol-prefix GExiv2
--template
/usr/ports/graphics/gexiv2/work/gexiv2-0.14.0/_build/../gexiv2/gexiv2-enums.h.template
/usr/ports/graphics/gexiv2/work/gexiv2-0.14.0/_build/../gexiv2/gexiv2-metadata.h
/usr/ports/graphics/gexiv2/work/gexiv2-0.14.0/_build/../gexiv2/gexiv2-log.h
--- stderr ---
env: /usr/local/bin/python3.8: No such file or directory

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