component/gtk-3: add slapos python3 in PATH

component/gtk-3/buildout.cfg

@@ -11,6 +11,7 @@ extends =
   ../meson/buildout.cfg
   ../nodejs/buildout.cfg
   ../ninja/buildout.cfg
+  ../python3/buildout.cfg
   ../xorg/buildout.cfg
 
 [at-spi2-core]
@@ -21,7 +22,7 @@ md5sum = 3da5fe62a653e49dad1c47f9a46fee56
 configure-options =
   --disable-gtk-doc-html
 environment =
-  PATH=${dbus:location}/bin:${gettext:location}/bin:${glib:location}/bin:${intltool:location}/bin:${perl-XML-Parser:perl-PATH}:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
+  PATH=${dbus:location}/bin:${gettext:location}/bin:${glib:location}/bin:${intltool:location}/bin:${perl-XML-Parser:perl-PATH}:${pkgconfig:location}/bin:${xz-utils:location}/bin:${python3:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${dbus:location}/lib/pkgconfig:${glib:location}/lib/pkgconfig:${glib:pkg_config_depends}
   CPPFLAGS=-I${inputproto:location}/include -I${xorgproto:location}/include -I${libX11:location}/include -I${libXi:location}/include -I${libXtst:location}/include -I${xextproto:location}/include -I${xproto:location}/include
   LDFLAGS=-L${libX11:location}/lib -Wl,-rpath=${libX11:location}/lib -L${libXi:location}/lib -Wl,-rpath=${libXi:location}/lib -L${libXtst:location}/lib -Wl,-rpath=${libXtst:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${glib:location}/lib
@@ -68,7 +69,7 @@ configure-options =
   --enable-xcomposite
   --enable-xdamage
 environment =
-  PATH=${gdk-pixbuf:location}/bin:${gettext:location}/bin:${glib:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
+  PATH=${gdk-pixbuf:location}/bin:${gettext:location}/bin:${glib:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:${python3:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${:pkg_config_depends}
 # not taken from pkg-config result...
   CPPFLAGS=-I${cairo:location}/include -I${inputproto:location}/include -I${libX11:location}/include -I${libXi:location}/include -I${xproto:location}/include -I${xorgproto:location}/include -I${libXrender:location}/include -I${renderext:location}/include -I${libXext:location}/include -I${libX11:location}/include  -I${libXinerama:location}/include -I${gdk-pixbuf:location}/include -I${libXrandr:location}/include -I${xfixes:location}/include -I${libXcomposite:location}/include -I${xdamage:location}/include