component/gtk-2: fix atk python usage

component/gtk-2/buildout.cfg

@@ -107,7 +107,7 @@ md5sum = 4dcea15cbf166706c166fc4fee05e3f8
 configure-command = ${meson:location}/bin/meson builddir --wrap-mode=nodownload --libdir=lib -Dprefix=@@LOCATION@@ -Ddocs=false -Dintrospection=false
 make-binary = ninja -C builddir
 environment =
-  PATH=${glib:location}/bin:${ninja:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
+  PATH=${glib:location}/bin:${python3:location}/bin:${ninja:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${glib:location}/lib/pkgconfig:${glib:pkg_config_depends}
   CFLAGS=-I${gettext:location}/include
   LDFLAGS=-L${gettext:location}/lib -lintl -Wl,-rpath=${gettext:location}/lib -Wl,-rpath=${glib:location}/lib