component/glibmm: add slapos python3 in PATH

component/glibmm/buildout.cfg

@@ -6,6 +6,7 @@ extends =
   ../meson/buildout.cfg
   ../ninja/buildout.cfg
   ../perl/buildout.cfg
+  ../python3/buildout.cfg
   ../pkgconfig/buildout.cfg
   ../xz-utils/buildout.cfg
 parts =
@@ -20,7 +21,7 @@ pkg_config_depends = ${glib:location}/lib/pkgconfig:${glib:pkg_config_depends}:$
 configure-command = ${meson:location}/bin/meson builddir --libdir=lib -Dprefix=@@LOCATION@@
 make-binary = ninja -C builddir
 environment =
-  PATH=${perl:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:${glib:location}/bin:${ninja:location}/bin:%(PATH)s
+  PATH=${python3:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:${glib:location}/bin:${ninja:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${:pkg_config_depends}
   CPPFLAGS=-I${gettext:location}/include
   LDFLAGS=-L${gettext:location}/lib -Wl,-rpath=${gettext:location}/lib -Wl,-rpath=${glib:location}/lib -Wl,-rpath=${libsigc:location}/lib -Wl,-rpath=@@LOCATION@@/lib