gedit: Add dep on python-six-native

Fixes errors e.g.
recipe-sysroot-native/usr/share/gtk-doc/python/gtkdoc/common.py", line 31, in <module>
    import six
ImportError: No module named 'six'
make[3]: *** [install-data-local] Error 1

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-gnome/recipes-gnome/gedit/gedit_2.30.4.bb

@@ -3,11 +3,13 @@ SECTION = "x11/gnome"
 LICENSE = "GPLv2+"
 PR = "r2"
 
-DEPENDS = "gvfs enchant gconf gnome-doc-utils glib-2.0 gtk+ gtksourceview2 iso-codes intltool-native gnome-common-native libice"
+DEPENDS = "gvfs enchant gconf gnome-doc-utils glib-2.0 gtk+ \
+           gtksourceview2 iso-codes intltool-native gnome-common-native \
+           libice python3-six-native"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f"
 
-inherit distro_features_check gnome gettext pythonnative
+inherit distro_features_check gnome gettext python3native
 
 REQUIRED_DISTRO_FEATURES = "x11"