gtk2-engines: add hash file

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gtk2-engines/gtk2-engines.hash

@@ -0,0 +1,2 @@
+# From http://ftp.gnome.org/pub/gnome/sources/gtk-engines/2.20/gtk-engines-2.20.2.sha256sum
+sha256	15b680abca6c773ecb85253521fa100dd3b8549befeecc7595b10209d62d66b5	gtk-engines-2.20.2.tar.bz2