glib2: build conflicts with gobject-introspection

[lukaso (Lukas Oberhuber)]

Error: Failed to activate glib2: Image error: /Users/lukasoberhuber/macports-gimp3-arm64/lib/girepository-1.0/GLib-2.0.typelib is being used by the active gobject-introspection port.  Please deactivate this port first, or use 'port -f activate glib2' to force the activation.
    while executing
"throw registry::image-error $msg"
    ("foreach" body line 47)
    invoked from within
"foreach file $imagefiles {
                set srcfile "${extracted_dir}${file}"

                # To be able to install links, we test if we can lst..."
    invoked from within
"registry::write {
            foreach file $imagefiles {
                set srcfile "${extracted_dir}${file}"

                # To be able to instal..."

[lukaso (Lukas Oberhuber)]

gobject-introspection was also updated so there is an inherent flaw in both. Suggest rolling back until fixed.

[ryandesign (Ryan Carsten Schmidt)]

Duplicate of #69748.